build and push mimic images for arm64
build and push mimic images for arm64

Add arm64 support to the images we build and push on the docker
registry.

Signed-off-by: Sébastien Han <62d754cc350e84d3b1c32ae79f976f5348e74a40@redhat.com>

JrCs/ceph-docker,JrCs/ceph-docker,JrCs/ceph-docker