GitLab Pages API not working for external pages instances
When trying out the internal GitLab pages API in 12.5, GitLab just returns HTTP error 500, because the
the gitlab_pages_secret
is not generated.
With GitLab 12.6, the GitLab daemon will access this internal API by default. This secret is only generated, if GitLab pages is enabled within Omnibus, which is not the case when using an external pages server.