This reuses the code from status.torproject.org, for now: we'll
eventually move this to a template project (or system-wide templates)
but I just want to get this out the door for now.

This has not been tested outside of status.torproject.org, so it might
not quite work yet. GitLab doesn't have privileges to push to the
actual server yet, so this shouldn't affect production until the SSH
key is added to the project.

(actually they were added some months ago, and this commit makes the
website up to date.)

Fixes: #29560

Information based on email from Matt Wright.