build multi-platform image + fix variable usage

Signed-off-by: Przemysław Grądzki <[email protected]>

.github/workflows/docker-image.yml

@@ -13,6 +13,10 @@ jobs:
     env:
       dockerhub_username: ${{ secrets.DOCKERHUB_USERNAME }}
     steps:
+      -
+        name: Get branch names.
+        id: branch-names
+        uses: tj-actions/branch-names@v8
       -
         name: Checkout
         uses: actions/checkout@v4
@@ -23,34 +27,30 @@ jobs:
         with:
           username: ${{ secrets.DOCKERHUB_USERNAME }}
           password: ${{ secrets.DOCKERHUB_TOKEN }}
+      -
+        name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
       -
         name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
-
-      - name: Extract metadata (tags, labels) for Docker
+      -
+        name: Get current date
+        run: echo "NOW=$(date -u +'%Y-%m-%d')" >> $env:$GITHUB_ENV
+      -
+        name: Extract metadata (tags, labels) for Docker
         id: meta
         uses: docker/metadata-action@v5
         with:
           images: ${{ github.repository }}
           labels: |
-            org.${{ github.repository_owner }}.ontology-publisher.release-date={{date 'YYYY-MM-DD'}}
-            org.${{ github.repository_owner }}.ontology-publisher.version={{branch}}
-      -
-        name: Build and push ${{ github.repository }}:${{ steps.meta.outputs.version }} for linux/amd64 platform
-        uses: docker/build-push-action@v5
-        with:
-          context: .
-          platforms: linux/amd64
-          push: ${{ env.dockerhub_username != '' }}
-          tags: ${{ github.repository }}:${{ steps.meta.outputs.version }}
-          annotations: ${{ steps.meta.outputs.annotations }}
-          labels: ${{ steps.meta.outputs.labels }}
+            org.${{ github.repository_owner }}.ontology-publisher.release-date=${{ env.NOW }}
+            org.${{ github.repository_owner }}.ontology-publisher.version=${{ steps.branch-names.outputs.current_branch }}
       -
-        name: Build and push ${{ github.repository }}:${{ steps.meta.outputs.version }} for linux/arm64 platform
+        name: Build and push ${{ github.repository }}:${{ steps.meta.outputs.version }}
         uses: docker/build-push-action@v5
         with:
           context: .
-          platforms: linux/arm64
+          platforms: linux/amd64,linux/arm64
           push: ${{ env.dockerhub_username != '' }}
           tags: ${{ github.repository }}:${{ steps.meta.outputs.version }}
           annotations: ${{ steps.meta.outputs.annotations }}