When trying to sync to another gitlab registry there was an issue encountered where the image path was not parsed correctly by skopeo. A longer image path will cause an error when attempting to sync.

customgitlab.example.com:
    images:
        gitlabgroup/repo/projectpath:
            - "latest"

The above will cause an error and skopeo will evaluate the above with customgitlab.example.com/projectpath:latest instead of the provided path for the image (customgitlab.example.com/gitlabgroup/repo/projectpath:latest).