Add multi-platform support for Docker image builds

Author: mbotezatu

.github/workflows/main.yml

@@ -56,6 +56,7 @@ jobs:
         uses: "docker/build-push-action@v5"
         with:
           context: "."
+          platforms: "linux/386,linux/amd64,linux/arm,linux/arm64"
           push: "${{ github.event_name != 'pull_request' }}"
           tags: ${{ steps.docker_metadata.outputs.tags }}
           labels: ${{ steps.docker_metadata.outputs.labels }}