Use docker/metadata-action

This will generate tags based on specific patterns, as well as add metadata labels to the images as per [the OpenContainers spec](https://github.com/opencontainers/image-spec/blob/main/annotations.md).

.github/workflows/docker.yml

@@ -20,12 +20,15 @@ jobs:
     steps:
       - name: checkout code
         uses: actions/checkout@v2
+
       - name: Set hash
         id: vars
         run: echo "::set-output name=sha_short::$(git rev-parse --short HEAD)"
+
       - name: Get current date
         id: date
         run: echo "::set-output name=date::$(date +'%Y-%m-%d')"
+
       - name: create-json
         id: create-json
         uses: jsdaniell/create-json@1.1.2
@@ -33,15 +36,35 @@ jobs:
           name: "version.json"
           json: '{"type": "docker", "tag": "${{secrets.DOCKERHUB_MASTER_TAG}}", "commit": "${{ steps.vars.outputs.sha_short }}", "date": "${{ steps.date.outputs.date }}"}'
           dir: 'backend/'
+
       - name: setup platform emulator
         uses: docker/setup-qemu-action@v1
+
       - name: setup multi-arch docker build
         uses: docker/setup-buildx-action@v1
+
+      - name: Generate Docker image metadata
+        id: docker-meta
+        uses: docker/metadata-action@v4
+        # Defaults:
+        #     DOCKERHUB_USERNAME  : tzahi12345
+        #     DOCKERHUB_REPO      : youtubedl-material
+        #     DOCKERHUB_MASTER_TAG: nightly
+        with:
+          images: |
+            ${{ secrets.DOCKERHUB_USERNAME }}/${{ secrets.DOCKERHUB_REPO }}
+            ghcr.io/${{ github.repository_owner }}/${{ secrets.DOCKERHUB_REPO }}
+          tags: |
+            type=raw,${{secrets.DOCKERHUB_MASTER_TAG}}-{{ date 'YYYY-MM-DD' }}
+            type=raw,${{secrets.DOCKERHUB_MASTER_TAG}}
+            type=sha,prefix=sha-,format=short
+
       - name: Login to DockerHub
         uses: docker/login-action@v1
         with:
           username: ${{ secrets.DOCKERHUB_USERNAME }}
           password: ${{ secrets.DOCKERHUB_TOKEN }}
+
       - name: build & push images
         uses: docker/build-push-action@v2
         with:
@@ -49,8 +72,5 @@ jobs:
           file: ./Dockerfile
           platforms: linux/amd64,linux/arm,linux/arm64/v8
           push: true
-          # Defaults:
+          tags: ${{ steps.docker-meta.outputs.tags }}
-          #     DOCKERHUB_USERNAME  : tzahi12345
+          labels: ${{ steps.docker-meta.outputs.labels }}
-          #     DOCKERHUB_REPO      : youtubedl-material
-          #     DOCKERHUB_MASTER_TAG: nightly
-          tags: ${{ secrets.DOCKERHUB_USERNAME }}/${{ secrets.DOCKERHUB_REPO }}:${{secrets.DOCKERHUB_MASTER_TAG}}