Render gitlab-pages admin settings
For https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/18372
We are changing the interaction between gitlab-rails and gitlab-pages from "gitlab-rails updates files on disk for gitlab-pages" to "gitlab-rails makes gRPC calls to the gitlab-pages admin API". This change sets up plumbing to support this. The gitlab-pages admin API itself only supports a health check at the moment.
Edited by GitLab Release Tools Bot