Create all tags, not just vX.Y.Z

action.yml

@@ -26,6 +26,7 @@ runs:
       shell: bash
       run: |
         '${{ github.action_path }}/build.bash' . push "$(tr -d v <<<'${{ github.ref_name }}')"
+        '${{ github.action_path }}/mktags.bash' '${{ github.ref_name }}'
 
     - if: github.event_name == 'push'
       shell: bash

build.bash

@@ -24,9 +24,9 @@ if ! docker buildx version; then
 	false
 fi
 
-COMMON_ARGS=(-t "icinga/icinga2:$TAG" --build-context "icinga2-git=$(realpath "$I2SRC")/.git" "$(realpath "$(dirname "$0")")")
-
-BUILDX=(docker buildx build --platform "$(echo linux/{amd64,arm{/v7,64/v8}} |tr ' ' ,)")
+OUR_DIR="$(realpath "$(dirname "$0")")"
+COMMON_ARGS=(-t "icinga/icinga2:$TAG" --build-context "icinga2-git=$(realpath "$I2SRC")/.git" "$OUR_DIR")
+BUILDX=(docker buildx build --platform "$(cat "${OUR_DIR}/platforms.txt")")
 
 case "$ACTION" in
 	all)

mktags.bash

@@ -0,0 +1,32 @@
+#!/bin/bash
+# Icinga 2 Docker image | (c) 2023 Icinga GmbH | GPLv2+
+set -exo pipefail
+
+if [[ "$1" =~ ^v((([0-9]+).([0-9]+)).[0-9]+)$ ]]; then
+  XYZ="${BASH_REMATCH[1]}"
+  XY="${BASH_REMATCH[2]}"
+  X="${BASH_REMATCH[3]}"
+  Y="${BASH_REMATCH[4]}"
+
+  BUILDX=(docker buildx build --platform "$(cat "$(realpath "$(dirname "$0")")/platforms.txt")" --push)
+  cd "$(mktemp -d)"
+
+  echo "FROM icinga/icinga2:$XYZ" >Dockerfile
+
+  "${BUILDX[@]}" -t "icinga/icinga2:$XY" .
+
+  NEXT="${X}.$(($Y+1))"
+
+  case "$(curl --head -sSLo /dev/null -w '%{http_code}' "https://hub.docker.com/v2/namespaces/icinga/repositories/icinga2/tags/$NEXT")" in
+    200)
+      ;;
+    404)
+      "${BUILDX[@]}" -t "icinga/icinga2:$X" .
+      "${BUILDX[@]}" -t icinga/icinga2 .
+      ;;
+    *)
+      echo "Can't check for icinga/icinga2:$NEXT"
+      false
+      ;;
+  esac
+fi

platforms.txt

@@ -0,0 +1 @@
+linux/amd64,linux/arm/v7,linux/arm64/v8