commit 1d5a1b5ad8c2522aeebf623b9e2d877404dca036
Author: Markus Pesch <markus.pesch@cryptic.systems>
Date:   Mon Aug 30 18:09:14 2021 +0200

    Initial Commit

diff --git a/.drone.yml b/.drone.yml
new file mode 100644
index 0000000..b03bb28
--- /dev/null
+++ b/.drone.yml
@@ -0,0 +1,228 @@
+---
+kind: pipeline
+type: kubernetes
+name: linter
+
+platform:
+  os: linux
+  arch: amd64
+
+steps:
+- name: markdown lint
+  commands:
+  - markdownlint *.md
+  image: docker.io/tmknom/markdownlint:0.23.1
+  resources:
+    limits:
+      cpu: 50
+      memory: 50M
+
+- name: email-notification
+  environment:
+    PLUGIN_HOST:
+      from_secret: smtp_host
+    PLUGIN_USERNAME:
+      from_secret: smtp_username
+    PLUGIN_PASSWORD:
+      from_secret: smtp_password
+    PLUGIN_FROM:
+      from_secret: smtp_mail_address
+  image: docker.io/drillster/drone-email:latest
+  resources:
+    limits:
+      cpu: 50
+      memory: 25M
+  when:
+    status:
+    - changed
+    - failure
+
+trigger:
+  event:
+    exclude:
+    - tag
+---
+kind: pipeline
+type: docker
+name: build-latest
+
+platform:
+  os: linux
+  arch: amd64
+
+steps:
+- name: build
+  image: docker.io/volkerraschek/build-image:latest
+  commands:
+  - make container-image/build
+  volumes:
+  - name: docker_socket
+    path: /var/run/docker.sock
+  when:
+    branch:
+    - master
+
+- name: push
+  image: docker.io/volkerraschek/build-image:latest
+  commands:
+  - make container-image/push
+  environment:
+    POSTFIXADMIN_IMAGE_REGISTRY_PASSWORD:
+      from_secret: container_image_registry_password
+  volumes:
+  - name: docker_socket
+    path: /var/run/docker.sock
+  when:
+    branch:
+    - master
+    repo:
+    - volker.raschek/postfixadmin-docker
+
+- name: delete
+  image: docker.io/volkerraschek/build-image:latest
+  commands:
+  - make container-image/delete
+  volumes:
+  - name: docker_socket
+    path: /var/run/docker.sock
+  when:
+    branch:
+    - master
+
+- name: notify
+  image: drillster/drone-email
+  environment:
+    PLUGIN_HOST:
+      from_secret: smtp_host
+    PLUGIN_USERNAME:
+      from_secret: smtp_username
+    PLUGIN_PASSWORD:
+      from_secret: smtp_password
+    PLUGIN_FROM:
+      from_secret: smtp_mail_address
+  when:
+    status:
+    - changed
+    - failure
+
+volumes:
+- name: docker_socket
+  host:
+    path: /var/run/docker.sock
+
+trigger:
+  event:
+    exclude:
+    - tag
+
+---
+kind: pipeline
+type: docker
+name: build-tagged
+
+platform:
+  os: linux
+  arch: amd64
+
+steps:
+- name: build
+  image: docker.io/volkerraschek/build-image:latest
+  commands:
+  - make container-image/build POSTFIXADMIN_IMAGE_VERSION=${DRONE_TAG}
+  volumes:
+  - name: docker_socket
+    path: /var/run/docker.sock
+
+- name: push
+  image: docker.io/volkerraschek/build-image:latest
+  commands:
+  - make container-image/push POSTFIXADMIN_IMAGE_VERSION=${DRONE_TAG}
+  environment:
+    POSTFIXADMIN_IMAGE_REGISTRY_PASSWORD:
+      from_secret: container_image_registry_password
+  volumes:
+  - name: docker_socket
+    path: /var/run/docker.sock
+
+- name: delete
+  image: docker.io/volkerraschek/build-image:latest
+  commands:
+  - make container-image/delete POSTFIXADMIN_IMAGE_VERSION=${DRONE_TAG}
+  volumes:
+  - name: docker_socket
+    path: /var/run/docker.sock
+
+- name: notify
+  image: drillster/drone-email
+  environment:
+    PLUGIN_HOST:
+      from_secret: smtp_host
+    PLUGIN_USERNAME:
+      from_secret: smtp_username
+    PLUGIN_PASSWORD:
+      from_secret: smtp_password
+    PLUGIN_FROM:
+      from_secret: smtp_mail_address
+  when:
+    status:
+    - changed
+    - failure
+
+volumes:
+- name: docker_socket
+  host:
+    path: /var/run/docker.sock
+
+trigger:
+  event:
+  - tag
+  repo:
+  - volker.raschek/postfixadmin-docker
+---
+kind: pipeline
+type: kubernetes
+name: sync
+
+platform:
+  os: linux
+  arch: amd64
+
+steps:
+- name: github
+  image: docker.io/appleboy/drone-git-push:latest
+  resources:
+    limits:
+      cpu: 50
+      memory: 25M
+  settings:
+    branch: master
+    remote: ssh://git@github.com/volker-raschek/postfixadmin-docker.git
+    force: true
+    ssh_key:
+      from_secret: ssh_key
+
+- name: email-notification
+  environment:
+    PLUGIN_HOST:
+      from_secret: smtp_host
+    PLUGIN_USERNAME:
+      from_secret: smtp_username
+    PLUGIN_PASSWORD:
+      from_secret: smtp_password
+    PLUGIN_FROM:
+      from_secret: smtp_mail_address
+  image: docker.io/drillster/drone-email:latest
+  resources:
+    limits:
+      cpu: 50
+      memory: 25M
+  when:
+    status:
+    - changed
+    - failure
+
+trigger:
+  event:
+  - push
+  repo:
+  - volker.raschek/postfixadmin-docker
diff --git a/.editorconfig b/.editorconfig
new file mode 100644
index 0000000..dd69de0
--- /dev/null
+++ b/.editorconfig
@@ -0,0 +1,15 @@
+# EditorConfig is awesome: https://EditorConfig.org
+
+# top-most EditorConfig file
+root = true
+
+[*]
+indent_style = space
+indent_size = 2
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = false
+
+[Makefile]
+indent_style = tab
\ No newline at end of file
diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 0000000..dcd9d00
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1 @@
+Makefile eol=lf
\ No newline at end of file
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..2eea525
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+.env
\ No newline at end of file
diff --git a/.markdownlint.yaml b/.markdownlint.yaml
new file mode 100644
index 0000000..855c24c
--- /dev/null
+++ b/.markdownlint.yaml
@@ -0,0 +1,144 @@
+# markdownlint YAML configuration
+# https://github.com/DavidAnson/markdownlint/blob/main/schema/.markdownlint.yaml
+
+# Default state for all rules
+default: true
+
+# Path to configuration file to extend
+extends: null
+
+# MD003/heading-style/header-style - Heading style
+MD003:
+  # Heading style
+  style: "atx"
+
+# MD004/ul-style - Unordered list style
+MD004:
+  style: "dash"
+
+# MD007/ul-indent - Unordered list indentation
+MD007:
+  # Spaces for indent
+  indent: 2
+  # Whether to indent the first level of the list
+  start_indented: false
+
+# MD009/no-trailing-spaces - Trailing spaces
+MD009:
+  # Spaces for line break
+  br_spaces: 2
+  # Allow spaces for empty lines in list items
+  list_item_empty_lines: false
+  # Include unnecessary breaks
+  strict: false
+
+# MD010/no-hard-tabs - Hard tabs
+MD010:
+  # Include code blocks
+  code_blocks: true
+
+# MD012/no-multiple-blanks - Multiple consecutive blank lines
+MD012:
+  # Consecutive blank lines
+  maximum: 1
+
+# MD013/line-length - Line length
+MD013:
+  # Number of characters
+  line_length: 80
+  # Number of characters for headings
+  heading_line_length: 80
+  # Number of characters for code blocks
+  code_block_line_length: 80
+  # Include code blocks
+  code_blocks: false
+  # Include tables
+  tables: false
+  # Include headings
+  headings: true
+  # Include headings
+  headers: true
+  # Strict length checking
+  strict: false
+  # Stern length checking
+  stern: false
+
+# MD022/blanks-around-headings/blanks-around-headers - Headings should be surrounded by blank lines
+MD022:
+  # Blank lines above heading
+  lines_above: 1
+  # Blank lines below heading
+  lines_below: 1
+
+# MD024/no-duplicate-heading/no-duplicate-header - Multiple headings with the same content
+MD024:
+  # Only check sibling headings
+  allow_different_nesting: true
+
+# MD025/single-title/single-h1 - Multiple top-level headings in the same document
+MD025:
+  # Heading level
+  level: 1
+  # RegExp for matching title in front matter
+  front_matter_title: "^\\s*title\\s*[:=]"
+
+# MD026/no-trailing-punctuation - Trailing punctuation in heading
+MD026:
+  # Punctuation characters
+  punctuation: ".,;:!。，；：！"
+
+# MD029/ol-prefix - Ordered list item prefix
+MD029:
+  # List style
+  style: "one_or_ordered"
+
+# MD030/list-marker-space - Spaces after list markers
+MD030:
+  # Spaces for single-line unordered list items
+  ul_single: 1
+  # Spaces for single-line ordered list items
+  ol_single: 1
+  # Spaces for multi-line unordered list items
+  ul_multi: 1
+  # Spaces for multi-line ordered list items
+  ol_multi: 1
+
+# MD033/no-inline-html - Inline HTML
+MD033:
+  # Allowed elements
+  allowed_elements: []
+
+# MD035/hr-style - Horizontal rule style
+MD035:
+  # Horizontal rule style
+  style: "---"
+
+# MD036/no-emphasis-as-heading/no-emphasis-as-header - Emphasis used instead of a heading
+MD036:
+  # Punctuation characters
+  punctuation: ".,;:!?。，；：！？"
+
+# MD041/first-line-heading/first-line-h1 - First line in a file should be a top-level heading
+MD041:
+  # Heading level
+  level: 1
+  # RegExp for matching title in front matter
+  front_matter_title: "^\\s*title\\s*[:=]"
+
+# MD044/proper-names - Proper names should have the correct capitalization
+MD044:
+  # List of proper names
+  names:
+  - PostfixAdmin
+  # Include code blocks
+  code_blocks: false
+
+# MD046/code-block-style - Code block style
+MD046:
+  # Block style
+  style: "fenced"
+
+# MD048/code-fence-style - Code fence style
+MD048:
+  # Code fence syle
+  style: "backtick"
\ No newline at end of file
diff --git a/Dockerfile b/Dockerfile
new file mode 100644
index 0000000..3b25114
--- /dev/null
+++ b/Dockerfile
@@ -0,0 +1,70 @@
+FROM docker.io/library/php:7.4-apache
+
+# POSTFIXADMIN VERSION
+ARG POSTFIXADMIN_VERSION \
+    POSTFIXADMIN_SHA512
+
+# APACHE
+ENV APACHE_DOCUMENT_ROOT /var/www/html/public
+
+RUN set -eu; \
+  sed --in-place --regexp-extended 's#/var/www/html#${APACHE_DOCUMENT_ROOT}#g' /etc/apache2/sites-available/*.conf; \
+  sed --in-place --regexp-extended 's#/var/www/#${APACHE_DOCUMENT_ROOT}#g' /etc/apache2/apache2.conf /etc/apache2/conf-available/*.conf
+
+# DEFAULT DATABASE SETTINGS
+ENV POSTFIXADMIN_DATABASE_TYPE=sqlite \
+    POSTFIXADMIN_DATABASE_HOST="" \
+    POSTFIXADMIN_DATABASE_PORT="" \
+    POSTFIXADMIN_DATABASE_USER="" \
+    POSTFIXADMIN_DATABASE_PASSWORD="" \
+    POSTFIXADMIN_SMTP_SERVER="localhost" \
+    POSTFIXADMIN_SMTP_PORT="25" \
+    POSTFIXADMIN_ENCRYPT="md5crypt"
+
+# docker-entrypoint.sh dependencies
+RUN set -eux; \
+  apt-get update; \
+  apt-get install --yes --no-install-recommends gosu; \
+  rm --recursive --force /var/lib/apt/lists/*
+
+# Install required PHP extensions
+RUN set -ex; \
+  savedAptMark="$(apt-mark showmanual)"; \
+  apt-get update; \
+  apt-get install --yes --no-install-recommends \
+    libc-client2007e-dev \
+    libkrb5-dev \
+    libpq-dev \
+    libsqlite3-dev; \
+  docker-php-ext-configure imap --with-imap-ssl --with-kerberos; \
+  docker-php-ext-install -j "$(nproc)" \
+    imap \
+    pdo_mysql \
+    pdo_pgsql \
+    pdo_sqlite \
+    pgsql; \
+  apt-mark auto '.*' > /dev/null; \
+  apt-mark manual $savedAptMark; \
+    ldd "$(php -r 'echo ini_get("extension_dir");')"/*.so \
+    | awk '/=>/ { print $3 }' \
+    | sort -u \
+    | xargs -r dpkg-query -S \
+    | cut -d: -f1 \
+    | sort -u \
+    | xargs -rt apt-mark manual; \
+  apt-get purge --yes --auto-remove -o APT::AutoRemove::RecommendsImportant=false; \
+  rm --recursive --force /var/lib/apt/lists/*
+
+RUN set -eu; \
+  curl --fail --silent --show-error --location "https://github.com/postfixadmin/postfixadmin/archive/postfixadmin-${POSTFIXADMIN_VERSION}.tar.gz" --output postfixadmin.tar.gz ; \
+  echo "${POSTFIXADMIN_SHA512} *postfixadmin.tar.gz" | sha512sum -c -; \
+  tar --extract --file postfixadmin.tar.gz --directory /var/www/html --strip-components=1; \
+  rm postfixadmin.tar.gz; \
+  # Does not exist in tarball but is required
+  mkdir --parents /var/www/html/templates_c; \
+  chown --recursive www-data:www-data /var/www/html
+
+COPY entrypoint.sh /usr/local/bin/
+
+ENTRYPOINT ["/usr/local/bin/entrypoint.sh"]
+CMD ["apache2-foreground"]
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..5a82408
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,13 @@
+Copyright 2019 Markus Pesch
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
\ No newline at end of file
diff --git a/Makefile b/Makefile
new file mode 100644
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--- /dev/null
+++ b/Makefile
@@ -0,0 +1,52 @@
+POSTFIXADMIN_VERSION:=3.3.10
+POSTFIXADMIN_SHA512:=e00fc9ea343a928976d191adfa01020ee0c6ddbe80a39e01ca2ee414a18247958f033970f378fe4a9974636172a5e094e57117ee9ac7b930c592f433097a7aca
+
+# CONTAINER_RUNTIME
+# The CONTAINER_RUNTIME variable will be used to specified the path to a
+# container runtime. This is needed to start and run a container image.
+CONTAINER_RUNTIME?=$(shell which docker)
+
+# POSTFIXADMIN_IMAGE_REGISTRY_NAME
+# Defines the name of the new container to be built using several variables.
+POSTFIXADMIN_IMAGE_REGISTRY_NAME:=docker.io
+POSTFIXADMIN_IMAGE_REGISTRY_USER:=volkerraschek
+
+POSTFIXADMIN_IMAGE_NAMESPACE?=${POSTFIXADMIN_IMAGE_REGISTRY_USER}
+POSTFIXADMIN_IMAGE_NAME:=postfixadmin
+POSTFIXADMIN_IMAGE_VERSION?=latest
+POSTFIXADMIN_IMAGE_FULLY_QUALIFIED=${POSTFIXADMIN_IMAGE_REGISTRY_NAME}/${POSTFIXADMIN_IMAGE_NAMESPACE}/${POSTFIXADMIN_IMAGE_NAME}:${POSTFIXADMIN_IMAGE_VERSION}
+POSTFIXADMIN_IMAGE_UNQUALIFIED=${POSTFIXADMIN_IMAGE_NAMESPACE}/${POSTFIXADMIN_IMAGE_NAME}:${POSTFIXADMIN_IMAGE_VERSION}
+
+# BUILD CONTAINER IMAGE
+# ==============================================================================
+PHONY:=container-image/build
+container-image/build:
+	${CONTAINER_RUNTIME} build \
+		--build-arg POSTFIXADMIN_VERSION=${POSTFIXADMIN_VERSION} \
+		--build-arg POSTFIXADMIN_SHA512=${POSTFIXADMIN_SHA512} \
+		--file Dockerfile \
+		--no-cache \
+		--pull \
+		--tag ${POSTFIXADMIN_IMAGE_FULLY_QUALIFIED} \
+		--tag ${POSTFIXADMIN_IMAGE_UNQUALIFIED} \
+		.
+
+# DELETE CONTAINER IMAGE
+# ==============================================================================
+PHONY:=container-image/delete
+container-image/delete:
+	- ${CONTAINER_RUNTIME} image rm ${POSTFIXADMIN_IMAGE_FULLY_QUALIFIED} ${POSTFIXADMIN_IMAGE_UNQUALIFIED}
+	- ${CONTAINER_RUNTIME} image rm ${PHP_IMAGE_FULL}
+
+# PUSH CONTAINER IMAGE
+# ==============================================================================
+PHONY+=container-image/push
+container-image/push:
+	echo ${POSTFIXADMIN_IMAGE_REGISTRY_PASSWORD} | ${CONTAINER_RUNTIME} login ${POSTFIXADMIN_IMAGE_REGISTRY_NAME} --username ${POSTFIXADMIN_IMAGE_REGISTRY_USER} --password-stdin
+	${CONTAINER_RUNTIME} push ${POSTFIXADMIN_IMAGE_FULLY_QUALIFIED}
+
+# PHONY
+# ==============================================================================
+# Declare the contents of the PHONY variable as phony.  We keep that information
+# in a variable so we can use it in if_changed.
+.PHONY: ${PHONY}
\ No newline at end of file
diff --git a/README.md b/README.md
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index 0000000..20a8ae6
--- /dev/null
+++ b/README.md
@@ -0,0 +1,177 @@
+# PostfixAdmin
+
+[![Build Status](https://drone.cryptic.systems/api/badges/volker.raschek/postfixadmin-docker/status.svg)](https://drone.cryptic.systems/volker.raschek/postfixadmin-docker)
+[![Docker Pulls](https://img.shields.io/docker/pulls/volkerraschek/postfixadmin)](https://hub.docker.com/r/volkerraschek/postfixadmin)
+[![Artifact Hub](https://img.shields.io/endpoint?url=https://artifacthub.io/badge/repository/volker-raschek)](https://artifacthub.io/packages/search?repo=volker-raschek)
+
+This is an alternative project to build a container image for
+[PostfixAdmin](https://github.com/postfixadmin/postfixadmin).
+
+The main goal of this alternative image is to support a kubernetes deployment
+via helm. Furthermore, the container image support configuring via environment
+variables.
+
+Checkout the helm repository of
+[volker-raschek](https://artifacthub.io/packages/helm/volker-raschek/postfixadmin)
+on [artifacthub.io](https://artifacthub.io) for more details.
+
+## Supported environment variables
+
+This list is an overview over some important environment variables. The
+environment variables are composed on the key of the PHP configuration with the
+prefix `POSTFIXADMIN_`. You can take an example
+[configuration](https://github.com/postfixadmin/postfixadmin/blob/master/config.inc.php)
+from the upstream project.
+
+| name                                | default                     |
+| ----------------------------------- | --------------------------- |
+| `POSTFIXADMIN_ADMIN_EMAIL`          |                             |
+| `POSTFIXADMIN_ADMIN_SMTP_PASSWORD`  |                             |
+| `POSTFIXADMIN_ADMIN_NAME`           |                             |
+| `POSTFIXADMIN_DATABASE_TYPE`        | `sqlite`                    |
+| `POSTFIXADMIN_DATABASE_USER`        |                             |
+| `POSTFIXADMIN_DATABASE_PASSWORD`    |                             |
+| `POSTFIXADMIN_DATABASE_HOST`        |                             |
+| `POSTFIXADMIN_DATABASE_PORT`        |                             |
+| `POSTFIXADMIN_DATABASE_NAME`        | `/var/tmp/postfixadmin.db`  |
+| `POSTFIXADMIN_DEFAULT_LANGUAGE`     | `en`                        |
+| `POSTFIXADMIN_DATABASE_USE_SSL`     |                             |
+| `POSTFIXADMIN_DATABASE_KEY`         |                             |
+| `POSTFIXADMIN_DATABASE_CERT`        |                             |
+| `POSTFIXADMIN_DATABASE_CA`          |                             |
+| `POSTFIXADMIN_DATABASE_PREFIX`      |                             |
+| `POSTFIXADMIN_ENCRYPT`              | `md5crypt`                  |
+| `POSTFIXADMIN_SMTP_SERVER`          | `localhost`                 |
+| `POSTFIXADMIN_SMTP_PORT`            | `25`                        |
+
+### POSTFIXADMIN_ADMIN_EMAIL
+
+Define the email address of an admin via `POSTFIXADMIN_ADMIN_EMAIL` to send
+emails or broadcast messages in his name instead of the email address of the
+logged in admin, which wants to send an email or broadcast message about the
+PostfixAdmin interface. By default is the environment variable not defined. The
+value of the environment will be configured as the following config setting:
+`$CONF['admin_email']`.
+
+### POSTFIXADMIN_ADMIN_SMTP_PASSWORD
+
+Define the smtp password via `POSTFIXADMIN_ADMIN_SMTP_PASSWORD` of the admin
+which should be used to send emails or broadcast messages about the PostfixAdmin
+interface. By default is the environment variable not defined. The value of the
+environment will be configured as the following config setting:
+`$CONF['admin_smtp_password']`.
+
+### POSTFIXADMIN_ADMIN_NAME
+
+Define the name of the admin via `POSTFIXADMIN_ADMIN_NAME` which should be used
+to send emails or broadcast messages about the PostfixAdmin interface. By
+default is the environment variable not defined. The value of the environment
+will be configured as the following config setting: `$CONF['admin_name']`.
+
+### POSTFIXADMIN_DATABASE_TYPE
+
+PostfixAdmin support currently sqlite, postgres and mysql/mariadb. About the
+envrionment variable `POSTFIXADMIN_DATABASE_TYPE` can the backend type defined.
+The default value is `sqlite`.
+
+| database type | value     |
+| ------------- | --------- |
+| mysql/mariadb | `mysqli`  |
+| postgres      | `pgsql`   |
+| sqlite        | `sqlite`  |
+
+### POSTFIXADMIN_DATABASE_USER
+
+The environment variable `POSTFIXADMIN_DATABASE_USER` is undefined and only
+required if the database backend is not `sqlite`. The value of the environment
+will be configured as the following config setting: `$CONF['database_user']`.
+
+### POSTFIXADMIN_DATABASE_PASSWORD
+
+The environment variable `POSTFIXADMIN_DATABASE_PASSWORD` is undefined and only
+required if the database backend is not `sqlite`. The value of the environment
+will be configured as the following config setting: `$CONF['database_password']`.
+
+### POSTFIXADMIN_DATABASE_HOST
+
+The environment variable `POSTFIXADMIN_DATABASE_HOST` is undefined and only
+required if the database backend is not `sqlite`. The value of the environment
+will be configured as the following config setting: `$CONF['database_host']`.
+
+### POSTFIXADMIN_DATABASE_PORT
+
+The environment variable `POSTFIXADMIN_DATABASE_PORT` will automatically defined
+with default values when instead of `sqlite` an other database backend has been
+selected. The value of the environment will be configured as the following
+config setting: `$CONF['database_port']`.
+
+| database type   | default port  |
+| --------------- | ------------- |
+| mysqli/mariadb  | `3306`        |
+| postgres        | `5432`        |
+
+### POSTFIXADMIN_DATABASE_NAME
+
+The environment variable `POSTFIXADMIN_DATABASE_NAME` is defined by default with
+the value `/var/tmp/postfixadmin.db`. This is the path where the `sqlite`
+database is stored. If `pgsql` or `mysqli` is defined instead of `sqlite` as
+database backend type, can the environment variable used to define the database
+name. The value of the environment will be configured as the following config
+setting: `$CONF['database_name']`.
+
+### POSTFIXADMIN_DATABASE_USE_SSL
+
+Encrypt a database connection to an external database like postgres, mariadb or
+mysqli via SSL when `POSTFIXADMIN_DATABASE_USE_SSL=true`. Additionally should be
+the other SSL environment variables defined to establish successfully a SSL
+encrypted connection. The value of the environment will be configured as the
+following config setting: `$CONF['database_use_ssl']`.
+
+### POSTFIXADMIN_DATABASE_SSL_KEY
+
+Via `POSTFIXADMIN_DATABASE_SSL_KEY` can be the path to the private key defined
+which should be used to encrypt the database connection via SSL. By default is
+this environment variable undefined. The value of the environment will be
+configured as the following config setting: `$CONF['database_ssl_key']`.
+
+### POSTFIXADMIN_DATABASE_SSL_CERT
+
+Via `POSTFIXADMIN_DATABASE_SSL_CERT` can be the path to the certificate defined
+which should be used to encrypt the database connection via SSL. By default is
+this environment variable undefined. The value of the environment will be
+configured as the following config setting: `$CONF['database_ssl_cert']`.
+
+### POSTFIXADMIN_DATABASE_SSL_CA
+
+Via `POSTFIXADMIN_DATABASE_SSL_CA` can be the path to the root certificate of
+the certificate authority defined which should be trusted to encrypt the database
+connection via SSL. By default is this environment variable undefined. The value
+of the environment will be configured as the following config setting:
+`$CONF['database_ssl_ca']`.
+
+### POSTFIXADMIN_DATABASE_PREFIX
+
+It make much sense to use a prefix name for all PostfixAdmin related tables,
+when the tables, views and so on should be stored into a shared schema like
+`public`. About the environment variable `POSTFIXADMIN_DATABASE_PREFIX` can such
+a prefix defined. By default is this variable undefined, but when not it results
+in the config setting `$CONF['database_prefix']`.
+
+### POSTFIXADMIN_DEFAULT_LANGUAGE
+
+Default language of PostfixAdmin. Checkout the [official
+repository](https://github.com/postfixadmin/postfixadmin/tree/master/languages)
+under `./languages` to get a list of all supported languages.
+
+### POSTFIXADMIN_ENCRYPT
+
+Via `POSTFIXADMIN_ENCRYPT` can be the algorithm specified to encrypt passwords
+of users. The algorithm `md5crypt` is defined as default. Other possible values
+are documented
+[here](https://github.com/postfixadmin/postfixadmin/blob/master/DOCUMENTS/HASHING.md).
+
+### POSTFIXADMIN_SETUP_PASSWORD
+
+To login into the `setup.php` page is the setup password required. This can be
+defined via the variable `POSTFIXADMIN_SETUP_PASSWORD`. The password will not be
+configured in the `config.local.php` as plain text. It will be encrypted.
diff --git a/docker-compose.yml b/docker-compose.yml
new file mode 100644
index 0000000..b070468
--- /dev/null
+++ b/docker-compose.yml
@@ -0,0 +1,6 @@
+version: "3"
+services:
+  postfixadmin:
+    image: localhost/volkerraschek/postfixadmin:latest
+    ports:
+    - 0.0.0.0:8080:80/tcp
\ No newline at end of file
diff --git a/entrypoint.sh b/entrypoint.sh
new file mode 100755
index 0000000..cc4bedd
--- /dev/null
+++ b/entrypoint.sh
@@ -0,0 +1,72 @@
+#!/bin/bash
+
+DOCUMENT_ROOT=$(dirname ${APACHE_DOCUMENT_ROOT})
+
+# set default database port if undefined
+case "${POSTFIXADMIN_DATABASE_TYPE}" in
+  sqlite)
+    ;;
+  mysqli)
+    : "${POSTFIXADMIN_DATABASE_PORT:=3306}"
+    ;;
+  pgsql)
+    : "${POSTFIXADMIN_DATABASE_PORT:=5432}"
+    : "${POSTFIXADMIN_DATABASE_NAME:=postgres}"
+  ;;
+  *)
+  echo >&2 "${POSTFIXADMIN_DATABASE_TYPE} is not a supported value."
+  exit 1
+  ;;
+esac
+
+# check if database user and password is defined and if database answer of an icmp ping
+if [ "${POSTFIXADMIN_DATABASE_TYPE}" != "sqlite" ]; then
+  if [ -z "${POSTFIXADMIN_DATABASE_USER}" -o -z "${POSTFIXADMIN_DATABASE_PASSWORD}" ]; then
+    echo >&2 'Error: POSTFIXADMIN_DATABASE_USER and POSTFIXADMIN_DATABASE_PASSWORD must be specified. '
+    exit 1
+  fi
+  timeout 15 bash -c "until echo > /dev/tcp/${POSTFIXADMIN_DATABASE_HOST}/${POSTFIXADMIN_DATABASE_PORT}; do sleep 0.5; done"
+fi
+
+# create sqlite.db if sqlite is specified as backend
+if [ "${POSTFIXADMIN_DATABASE_TYPE}" = 'sqlite' ]; then
+  export POSTFIXADMIN_DATABASE_NAME=${POSTFIXADMIN_DATABASE_NAME:=/var/tmp/postfixadmin.db}
+
+  if [ ! -f "${POSTFIXADMIN_DATABASE_NAME}" ]; then
+    echo "Create sqlite database: ${POSTFIXADMIN_DATABASE_NAME}"
+    touch ${POSTFIXADMIN_DATABASE_NAME}
+    chown www-data:www-data ${POSTFIXADMIN_DATABASE_NAME}
+    chmod 0700 ${POSTFIXADMIN_DATABASE_NAME}
+  fi
+fi
+
+
+# create config.local.pgp with vaules from env with POSTFIXADMIN_ prefix
+POSTFIXADMIN_ENV_VARS=($(env | sort | grep --perl-regexp '^POSTFIXADMIN_.*'))
+
+cat > ${DOCUMENT_ROOT}/config.local.php <<EOF
+<?php
+  \$CONF['configured'] = true;
+EOF
+
+for ENV_VAR in ${POSTFIXADMIN_ENV_VARS[@]}; do
+  KEY=$(echo ${ENV_VAR} | cut --delimiter="=" --fields="1" | sed 's/POSTFIXADMIN_//' | tr '[:upper:]' '[:lower:]')
+  VALUE=$(echo ${ENV_VAR} | cut --delimiter="=" --fields="2")
+
+  echo "  \$CONF['${KEY}'] = '${VALUE}';" >> ${DOCUMENT_ROOT}/config.local.php
+done
+
+cat >> ${DOCUMENT_ROOT}/config.local.php <<EOF
+?>
+EOF
+
+chown www-data: ${DOCUMENT_ROOT}/config.local.php
+
+# start database migration
+
+if [ -f public/upgrade.php ]; then
+  echo "Running database / environment upgrade.php "
+  gosu www-data php public/upgrade.php
+fi
+
+exec "$@"