diff --git a/.drone.yml b/.drone.yml
new file mode 100644
index 0000000..33cf4af
--- /dev/null
+++ b/.drone.yml
@@ -0,0 +1,97 @@
+---
+kind: pipeline
+type: kubernetes
+name: linter
+
+clone:
+  disable: true
+
+steps:
+- name: clone
+  image: git.cryptic.systems/volker.raschek/git:1.3.1
+
+- name: markdown lint
+  commands:
+  - markdownlint *.md
+  image: git.cryptic.systems/volker.raschek/markdownlint:0.37.0
+  resources:
+    limits:
+      cpu: 150
+      memory: 150M
+
+- name: email-notification
+  environment:
+    SMTP_FROM_ADDRESS:
+      from_secret: smtp_from_address
+    SMTP_FROM_NAME:
+      from_secret: smtp_from_name
+    SMTP_HOST:
+      from_secret: smtp_host
+    SMTP_USERNAME:
+      from_secret: smtp_username
+    SMTP_PASSWORD:
+      from_secret: smtp_password
+  image: git.cryptic.systems/volker.raschek/drone-email:0.1.5
+  resources:
+    limits:
+      cpu: 150
+      memory: 150M
+  when:
+    status:
+    - changed
+    - failure
+
+trigger:
+  event:
+    exclude:
+    - tag
+
+---
+kind: pipeline
+type: kubernetes
+name: sync-to-aur.archlinux.org
+
+clone:
+  disable: true
+
+steps:
+- name: clone
+  image: git.cryptic.systems/volker.raschek/git:1.3.1
+
+- name: git-push
+  image: docker.io/appleboy/drone-git-push:1.0.6
+  settings:
+    branch: master
+    remote: ssh://aur@aur.archlinux.org/prometheus-x509-certificate-exporter.git
+    force: false
+    commit: false
+    ssh_key:
+      from_secret: aur_ssh_key
+
+- name: email-notification
+  environment:
+    SMTP_FROM_ADDRESS:
+      from_secret: smtp_from_address
+    SMTP_FROM_NAME:
+      from_secret: smtp_from_name
+    SMTP_HOST:
+      from_secret: smtp_host
+    SMTP_USERNAME:
+      from_secret: smtp_username
+    SMTP_PASSWORD:
+      from_secret: smtp_password
+  image: git.cryptic.systems/volker.raschek/drone-email:0.1.5
+  resources:
+    limits:
+      cpu: 150
+      memory: 150M
+  when:
+    status:
+    - changed
+    - failure
+
+trigger:
+  event:
+  - tag
+  repo:
+  - volker.raschek/prometheus-x509-certificate-exporter-pkg
\ No newline at end of file
diff --git a/.editorconfig b/.editorconfig
new file mode 100644
index 0000000..1166a4a
--- /dev/null
+++ b/.editorconfig
@@ -0,0 +1,12 @@
+# 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
\ No newline at end of file
diff --git a/.gitignore b/.gitignore
index 823aa8f..7d4ec31 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,5 +1,5 @@
 pkg
 src
-*tar.gz*
-*tar.zst*
-*.zip
+*tar.gz
+*tar.zst
+*tar.zst.sig
\ No newline at end of file
diff --git a/.markdownlint.yaml b/.markdownlint.yaml
new file mode 100644
index 0000000..54c8c83
--- /dev/null
+++ b/.markdownlint.yaml
@@ -0,0 +1,145 @@
+# 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: 120
+  # Number of characters for headings
+  heading_line_length: 120
+  # Number of characters for code blocks
+  code_block_line_length: 120
+  # 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:
+  - Arch Linux
+  - Linux Mint
+  # 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/README.md b/README.md
new file mode 100644
index 0000000..1f9dd5a
--- /dev/null
+++ b/README.md
@@ -0,0 +1,62 @@
+# prometheus-x509-certificate-exporter
+
+![AUR version](https://img.shields.io/aur/version/prometheus-x509-certificate-exporter?label=AUR)
+[![Build Status](https://drone.cryptic.systems/api/badges/volker.raschek/prometheus-x509-certificate-exporter-pkg/status.svg)](https://drone.cryptic.systems/volker.raschek/prometheus-x509-certificate-exporter-pkg)
+![AUR votes](https://img.shields.io/aur/votes/prometheus-x509-certificate-exporter)
+
+This repository contains build files to build the Arch Linux package `prometheus-x509-certificate-exporter`. Instead of building the
+package yourself, it can also be obtained from the following private repository. More detailed are described
+[here](#obtaining-pre-built-packages-from-a-repository).
+
+## Build
+
+Clone this repository and use `makepkg` to build the package by yourself. For example:
+
+```bash
+git clone https://aur.archlinux.org/prometheus-x509-certificate-exporter.git
+cd prometheus-x509-certificate-exporter
+makepkg
+```
+
+## Yay
+
+The build files are also available via AUR and can be installed via an AUR helper like `yay`.
+
+```bash
+yay --sync --aur prometheus-x509-certificate-exporter
+```
+
+## Obtaining pre-built packages from a repository
+
+Instead of building the packages locally, it is also possible to configure an additional repository to install the
+package directly via `pacman`. The following commands are used to create the repository, configure the GPG key to verify
+the packages and install the package:
+
+```bash
+# Create drop-in directory
+sudo mkdir --parents /etc/pacman.d/repos
+
+# Create configuration of the repository 'volker.raschek'
+sudo tee /etc/pacman.d/repos/volker.raschek.conf > /dev/null <<'EOF'
+[volker.raschek]
+SigLevel = PackageRequired TrustedOnly
+Include = /etc/pacman.d/repos/volker.raschek.list
+EOF
+
+# Create mirror list of the repository 'volker.raschek'
+sudo tee /etc/pacman.d/repos/volker.raschek.list > /dev/null <<'EOF'
+Server = https://aur.cryptic.systems/$repo/$arch
+EOF
+
+# Import gpg key of the repository 'volker.raschek'
+sudo pacman-key --keyserver hkps://keys.openpgp.org --recv-keys 9B146D11A9ED6CA7E279EB1A852BCC170D81A982
+
+# Extend existing pacman configuration of the repository 'volker.raschek'
+sudo echo "Include = /etc/pacman.d/repos/*.conf" >> /etc/pacman.conf
+
+# Update pacman cache
+sudo pacman --sync --refresh
+
+# Install the package and receive updates directly via pacman :)
+sudo pacman --sync prometheus-x509-certificate-exporter
+```
diff --git a/renovate.json b/renovate.json
new file mode 100644
index 0000000..0eb214c
--- /dev/null
+++ b/renovate.json
@@ -0,0 +1,17 @@
+{
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+  "assignees": [ "volker.raschek" ],
+  "automergeStrategy": "merge-commit",
+  "automergeType": "pr",
+  "labels": [ "renovate" ],
+  "packageRules": [
+    {
+      "addLabels": [ "renovate/droneci", "renovate/automerge" ],
+      "automerge": true,
+      "matchManagers": "droneci",
+      "matchUpdateTypes": [ "minor", "patch"]
+    }
+  ],
+  "rebaseLabel": "renovate/rebase",
+  "rebaseWhen": "behind-base-branch"
+}