Improve syncing tool such that it copies multi-architecture images correctly

[sanderegg]

The synchronisation tool that copies docker images to the different deploys does not copy multi-architecture images but only the architecture on which the CI runner is.

I could make it work by using the following code:

 docker run -it quay.io/skopeo/stable:latest sync --all --src docker --dest docker --dest-username USERNAME--dest-password PASSWORD itisfoundation/sleeper:2.1.3 DEST_REGISTRY

Please upgrade the skopeo and add the --all flag.