Build Docker image for both amd64 and arm64

Author: popen2

.github/workflows/main.yml

@@ -58,6 +58,8 @@ jobs:
     steps:
       - name: Check out the repo
         uses: actions/checkout@v4
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
       - name: Log in to the Container registry
         uses: docker/login-action@v3
         with:
@@ -78,6 +80,7 @@ jobs:
           context: .
           file: ./Dockerfile
           push: true
+          platforms: linux/amd64,linux/arm64
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}