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.
Right now GetTor attempts to delete the previous git release branch and upload a new one due to limits on repository sizes.
Perhaps a better way to handle this would be to set up Github releases. This can be done through the REST API.