chore(deps): update docker.io/library/alpine docker tag to v3.18.4

This reverts commit 3b4f12f596.

Dockerfile

@@ -1,4 +1,4 @@
-FROM docker.io/library/alpine:3.16.0
+FROM docker.io/library/alpine:3.18.4
 
 RUN echo "http://dl-3.alpinelinux.org/alpine/edge/testing/" >> /etc/apk/repositories
 RUN apk upgrade

Makefile

@@ -1,7 +1,7 @@
 # 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?=$(shell which docker)
+CONTAINER_RUNTIME?=$(shell which podman)
 
 # FETCHMAIL_IMAGE_REGISTRY_NAME
 # Defines the name of the new container to be built using several variables.

manifest.tmpl

@@ -1,4 +1,4 @@
-image: volkerraschek/postfixadmin-fetchmail:{{#if build.tag}}{{trimPrefix "v" build.tag}}{{else}}latest{{/if}}
+image: git.cryptic.systems/volker.raschek/postfixadmin-fetchmail:{{#if build.tag}}{{trimPrefix "v" build.tag}}{{else}}latest{{/if}}
 {{#if build.tags}}
 tags:
 {{#each build.tags}}
@@ -7,19 +7,16 @@ tags:
   - "latest"
 {{/if}}
 manifests:
-  -
+  - image: git.cryptic.systems/volker.raschek/postfixadmin-fetchmail:{{#if build.tag}}{{trimPrefix "v" build.tag}}{{else}}latest{{/if}}-amd64
-    image: volkerraschek/postfixadmin-fetchmail:{{#if build.tag}}{{trimPrefix "v" build.tag}}{{else}}latest{{/if}}-amd64
     platform:
       architecture: amd64
       os: linux
-  -
+  - image: git.cryptic.systems/volker.raschek/postfixadmin-fetchmail:{{#if build.tag}}{{trimPrefix "v" build.tag}}{{else}}latest{{/if}}-arm-v7
-    image: volkerraschek/postfixadmin-fetchmail:{{#if build.tag}}{{trimPrefix "v" build.tag}}{{else}}latest{{/if}}-arm-v7
     platform:
       architecture: arm
       os: linux
       variant: v7
-  -
+  - image: git.cryptic.systems/volker.raschek/postfixadmin-fetchmail:{{#if build.tag}}{{trimPrefix "v" build.tag}}{{else}}latest{{/if}}-arm64-v8
-    image: volkerraschek/postfixadmin-fetchmail:{{#if build.tag}}{{trimPrefix "v" build.tag}}{{else}}latest{{/if}}-arm64-v8
     platform:
       architecture: arm64
       os: linux

renovate.json

@@ -8,8 +8,17 @@
     {
       "addLabels": [ "renovate/droneci", "renovate/automerge" ],
       "automerge": true,
+      "excludePackagePatterns": [ "plugins/docker" ],
       "matchManagers": "droneci",
       "matchUpdateTypes": [ "minor", "patch"]
+    },
+    {
+      "description": "Automatically update patch version of used container images in docker files",
+      "addLabels": [ "renovate/container-image", "renovate/automerge" ],
+      "automerge": true,
+      "matchBaseBranches": [ "master" ],
+      "matchManagers": [ "dockerfile" ],
+      "matchUpdateTypes": [ "patch" ]
     }
   ],
   "rebaseLabel": "renovate/rebase",