Enable mailroom in canary environments
With epic &608 (closed) we rearranged the pipeline for deployment of GitLab.com. With this new arrangement, canary environments (in particular staging-canary) are more important with them being the first line of deployment and testing. As such, we need them to be full environments. An audit of canary at #2294 (closed) revealed we don't actually have mailroom in any canary environments.
This issue is identify and track the work that would be needed to enable mailroom in all canary environments.