Docker overlay2 backend is broken
Due to https://github.com/moby/moby/issues/39663. It has been disabled in .gitlab-ci.yml for now.
Due to a large amount of spam we do not allow new users to create repositories, they are "external" users. If you are a new user and want to create a repository, for example for forking GHC, open a new issue on ghc/ghc using the "get-verified" issue template
Due to https://github.com/moby/moby/issues/39663. It has been disabled in .gitlab-ci.yml for now.