Would be great if ECR could support cache-manifest (see: https://medium.com/titansoft-engineering/docker-build-cache-sharing-on-multi-hosts-with-buildkit-and-buildx-eb8f7005918e)

NOTE FROM AWS: We shipped this on BuildKit 0.12, see here for details - https://aws.amazon.com/blogs/containers/announcing-remote-cache-support-in-amazon-ecr-for-buildkit-clients/. We are keeping this issue open for the time being to allow the community to discuss and gather further feedback