Update GitHub Actions workflow to build multi-architecture Docker images

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

@@ -17,6 +17,9 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@v4
       
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+      
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
       
@@ -41,6 +44,7 @@ jobs:
         with:
           context: .
           push: true
+          platforms: linux/amd64,linux/arm64
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}
           cache-from: type=registry,ref=${{ secrets.DOCKERHUB_USERNAME }}/duckai:buildcache