Copy docker image between repositories

You can pull the image, tag it and push it to the new registry.

Example:

docker pull old-registry/app:some_tag
docker tag old-registry/app:some_tag new-registry/app:some_tag
docker push new-registry/app:some_tag

Can be done with https://github.com/containers/skopeo

Example for the README:

skopeo copy docker://quay.io/buildah/stable docker://registry.internal.company.com/buildah

The advantage is that Skopeo does not require Docker on the machine it runs on.

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