ci: update merge-and-push job in axosyslog-docker workflow

- after this change next docker tag will automatically
calculated in a following way:
  - if actual git tag version is greater than previous docker tag
    example:
       current git tag: 4.10.0
       last docker tag: 4.9.0-2
       next docker tag: 4.10.0-1
  - if actual git tag version is equals with previous docker tag
    example:
       current git tag: 4.9.0
       last docker tag: 4.9.0-2
       next docker tag: 4.9.0-3
  - if actual git tag version is less than previous docker tag, than
    compare script will display a warning and will exit

Signed-off-by: Andras Mitzki <[email protected]>

.github/workflows/axosyslog-docker.yml

@@ -138,6 +138,8 @@ jobs:
   merge-and-push:
     runs-on: ubuntu-latest
     needs: [prepare, image-build]
+    outputs:
+      tags: ${{ steps.docker-metadata-tags.outputs.tags }}
     steps:
       - name: Download digests
         uses: actions/download-artifact@v4
@@ -151,11 +153,30 @@ jobs:
 
       - name: Extract metadata (AxoSyslog version) for Docker
         id: docker-metadata-tags
-        uses: docker/metadata-action@v5
-        with:
-          images: ${{ needs.prepare.outputs.image-name }}
-          tags: type=match,pattern=axosyslog-([0-9].*),group=1
-          sep-tags: ','
+        run: |
+          previous_docker_tag=$(skopeo inspect docker://ghcr.io/axoflow/axosyslog:latest | jq '.RepoTags' | sed 's/ \|"\|,//g' | grep "^[0-9]*.[0-9]*.[0-9]*$\|^[0-9]*.[0-9]*.[0-9]*-[0-9]*$" | tail -n 1)
+          previous_docker_tag_short=$(echo $previous_docker_tag | cut -d"-" -f1)
+          previous_docker_tag_patch=$(echo $previous_docker_tag | cut -d"-" -f2)
+          current_git_tag=$(echo ${{ github.ref }} | cut -d"-" -f2)
+          function version { echo "$@" | awk -F. '{ printf("%d%03d%03d\n", $1,$2,$3); }'; }
+          if [ $(version $current_git_tag) -gt $(version $previous_docker_tag_short) ]; then
+              echo "Given git tag version is greater than previous docker tag version: $current_git_tag > $previous_docker_tag_short"
+              next_docker_tag_with_patch=$current_git_tag-1
+              next_docker_tag=$current_git_tag
+              echo "Next docker version tag: $next_docker_tag_with_patch"
+          elif [ $(version $current_git_tag) -eq $(version $previous_docker_tag_short) ]; then
+              echo "Given git tag version is equals with previous docker tag version: $current_git_tag == $previous_docker_tag_short"
+              next_docker_tag_patch=$((previous_docker_tag_patch+1))
+              next_docker_tag_with_patch=$previous_docker_tag_short-$next_docker_tag_patch
+              next_docker_tag=$previous_docker_tag_short
+              echo "Next docker version tag: $next_docker_tag_with_patch"
+          else
+              echo "Given git tag version is less than previous docker tag version: $current_git_tag < $previous_docker_tag_short"
+              echo "This is not allowed. Please provide a valid git tag version."
+              exit 1
+          fi
+          TAGS="ghcr.io/axoflow/axosyslog:$next_docker_tag,ghcr.io/axoflow/axosyslog:$next_docker_tag_with_patch,ghcr.io/axoflow/axosyslog:latest"
+          echo "tags=$TAGS" >> $GITHUB_OUTPUT
 
       - name: Compose Docker image tags
         id: tags