GitHub/Workflow: Update docker-metadata-tags

- query the latest released version
- create new patch version or increment latest patch version

Signed-off-by: Andras Mitzki <andras.mitzki@axoflow.com>

.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
@@ -149,13 +151,21 @@ jobs:
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
 
-      - name: Extract metadata (AxoSyslog version) for Docker
-        id: docker-metadata-tags
-        uses: docker/metadata-action@v5
-        with:
-          images: ${{ needs.prepare.outputs.image-name }}
-          tags: type=match,pattern=axosyslog-([0-9].*),group=1
-          sep-tags: ','
+      - id: docker-metadata-tags
+        name: Extract metadata (AxoSyslog version) for Docker
+        run: |
+          last_full_version=$(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)
+          if [[ $last_full_version == *"-"* ]]; then
+              last_version=$(echo $last_full_version | cut -d"-" -f1)
+              last_patch_level=$(echo $last_full_version | cut -d"-" -f2)
+              next_patch_level=$((last_patch_level + 1))
+          else
+              last_version=$(echo $last_full_version | cut -d"-" -f1)
+              next_patch_level=1
+          fi
+          next_full_version="$last_version-$next_patch_level"
+          TAGS="ghcr.io/axoflow/axosyslog:$last_version,ghcr.io/axoflow/axosyslog:$next_full_version,ghcr.io/axoflow/axosyslog:latest"
+          echo "tags=$TAGS" >> $GITHUB_OUTPUT
 
       - name: Compose Docker image tags
         id: tags