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.
After #40172 (closed) and #40241 (closed) landed make clean now fails with:
Error: Option var/gradle_version is undefined
Error: Error getting used files
make: *** [Makefile:211: clean] Error 1