Proper docker image tagging

.github/workflows/build-docker-image.yml

@@ -12,22 +12,33 @@ jobs:
     steps:
       - uses: actions/checkout@v2
 
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v1
+
       - name: Login to DockerHub
         uses: docker/login-action@v1 
         with:
           username: ${{ secrets.DOCKERHUB_USERNAME }}
           password: ${{ secrets.DOCKERHUB_PASSWORD }}
 
+      - name: Docker meta
+        id: docker_meta
+        uses: crazy-max/ghaction-docker-meta@v2
+        with:
+          images: indigoiam/voms-importer
+          tags: |
+            type=sha
+            type=semver,pattern={{raw}}
+            type=ref,event=branch
+
       - name: Copy script to docker dir
         run: cp vomsimporter.py docker
 
       - name: Build Docker image
         uses: docker/build-push-action@v2
         with:
-          tags: indigoiam/voms-importer:latest
+          tags: ${{ steps.docker_meta.outputs.tags }}
           context: ./docker
           file: ./docker/Dockerfile
-          push: false
-
-      - name: Push docker image
-        run: docker push indigoiam/voms-importer:latest
+          labels: ${{ steps.docker_meta.outputs.labels }}
+          push: ${{ startsWith(github.ref, 'refs/tags/') }}