ci: enable multi-platform build (amd64 and arm64)

.github/workflows/docker-publish.yml

@@ -34,6 +34,10 @@ jobs:
       - name: Checkout repository
         uses: actions/checkout@v4
 
+      # Set up QEMU for multi-platform builds
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+
       # Set up Docker Buildx
       # https://github.com/docker/setup-buildx-action
       - name: Set up Docker Buildx
@@ -67,5 +71,6 @@ jobs:
           push: ${{ github.event_name != 'pull_request' }}
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}
+          platforms: linux/amd64,linux/arm64
           cache-from: type=gha
           cache-to: type=gha,mode=max