Add docker/metadata-action for OCI labels (#108)

Author: firecow

.github/workflows/release.yml

@@ -19,8 +19,14 @@ jobs:
           registry: ghcr.io
           username: ${{github.actor}}
           password: ${{secrets.GITHUB_TOKEN}}
+      - uses: docker/metadata-action@v5.10.0
+        id: meta
+        with:
+          images: ghcr.io/cego/swarm-app
+          tags: type=semver,pattern={{version}}
       - uses: docker/build-push-action@v6
         with:
           platforms: linux/amd64,linux/arm64
           push: true
-          tags: ghcr.io/cego/swarm-app:${{ github.ref_name }}
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}