Add comment : issue with multi-arch build + load

See :
- docker/buildx#59

Author: ghusta

.github/workflows/docker-image.yml

@@ -31,6 +31,7 @@ jobs:
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v2
 
+      # See issue with multi-arch build + load : https://github.com/docker/buildx/issues/59
       - name: Build images (multi-architecture)
         uses: docker/build-push-action@v3
         with: