GitLab is used only for code review, issue tracking and project management. Canonical locations for source code are still https://gitweb.torproject.org/ https://git.torproject.org/ and git-rw.torproject.org.
Please create a new mailing list firstname.lastname@example.org and make Roger the list moderator.
(Just like #12410 (moved) except six months later. We'll also plan to close this list down once it's no longer needed.)