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.
We need to test IPv6 during Sponsor 55.
(If it's available on the local machine.)
To enable design management, you'll need to meet the requirements. If you need help, reach out to our support team for assistance.