* GitLab will not allow users (even admins) to add a project to a group unless that user is designated an `owner` of the group. This is by design in GitLab.
*`gitlab-mirrors` will not auto-create a group (though it will auto-create projects within a group). This is by design in `gitlab-mirrors`. One should create the group manually and assign the `gitmirror` user as an owner of the group. This is to ensure mirroring a repository for a particular group is a purposeful action.
*`gitlab-mirrors`**must not** be shared by the same user as GitLab which is typically the `git` user. It will not work and you'll run into a lot of configuration trouble.