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Description
What is the problem you're trying to solve
Right now, we rely solely on distribution registry (and cesanta/docker_auth) for login/push/pull testing.
It is a possibility that Harbor has some specific behaviors diverging from mainline registry (eg, looking at https://github.com/containerd/nerdctl/issues?q=is%3Aissue+is%3Aopen+harbor )
Describe the solution you'd like
Suggestion is to add https://hub.docker.com/r/bitnami/harbor-registry as one of our option, and tests against it as well.
If this does not uncover any issue at all, then we can consider disabling it.
Additional context
No response