Move Windows CI pipeline to PowerShell
It turns out that gitlab-runner is going to deprecate support for the cmd shell in June.
Moreover, the i386 pipeline is currently broken.
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
It turns out that gitlab-runner is going to deprecate support for the cmd shell in June.
Moreover, the i386 pipeline is currently broken.