Build and push multi-arch Docker images in CI

.github/workflows/docker-publish.yml

@@ -23,6 +23,9 @@ jobs:
       - name: Checkout repository
         uses: actions/checkout@v2
 
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v1
+
       - name: Log into registry ${{ env.REGISTRY }}
         uses: docker/login-action@v1
         with:
@@ -39,6 +42,7 @@ jobs:
       - name: Build and push Docker image
         uses: docker/build-push-action@v2
         with:
+          platforms: linux/amd64,linux/arm64,linux/arm/v7
           push: ${{ github.event_name != 'pull_request' }}
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}