docker-mirror-multiarch 
This repository shows how to mirror a multi-architecture Docker image such as arm64 or ppc64le.
Problem to solve
We cannot mirror a multi-architecture image by docker pull && docker push.
It copies only single architecture image.
How to solve
See mirror workflow.
This is based on https://stackoverflow.com/questions/68567983/how-to-copy-multi-arch-docker-images-to-a-different-container-registry and using regclient.