Expose `gitlab_ci` configuration in Rails

Summary

Currently, none of the ConfigMaps for the rails containers configure production.gitlab_ci. There are few settings, but we should expose them.

Configuration Used

global:
  appConfig:
    gitlabCi:
      allBrokenBuilds: false
      addPusher: false
      buildsPath: /tmp/blarg

Current behavior

production:
  gitlab_ci:
  ldap:
    ...

Expected behavior

production:
  gitlab_ci:
    all_broken_builds: false
    add_pusher: false
    builds_path: /tmp/blarg
  ldap:
    ...

Versions

• Chart: 1.3.4 | master@ 90390752

I can't say that we need gitlabCi.buildsPath, since we're using object storage, but this is included here, as it is currently output by the Omnibus.