Add linux/arm64 to platforms supported

.github/workflows/ci.yml

@@ -62,7 +62,7 @@ jobs:
         uses: docker/build-push-action@v2
         with:
           context: .
-          platforms: linux/amd64,linux/arm/v7
+          platforms: linux/amd64,linux/arm/v7,linux/arm64
           push: ${{ github.event_name != 'pull_request' }}
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}