Might as well use this thread for git.coop news…
We have enabled the GitLab Docker Registry at registry.git.coop and this means that you can now use GitLab CI to build and host Docker containers 
.
So far we have only built a couple of containers, one to be used by the Bind 9 zonefile repos CI (having packages pre-installed saves one minute per test after each update) and another with a recent version of Ansible for use by repos that are doing deployment using Ansible from Docker containers.
Thanks to @lukewm we now also have have SSO (single sign on) working from git.coop to the Libreho.st Discourse forum and Libreho.st GitLab — this means if you are logged into git.coop you can click through to login to these other sites.