Okay I got it working, I copied it form upstream
/usr/share/gitlab/app/models/project_wiki.rb
Change
["/", @project.path_with_namespace, "/wikis"].join('')
To
[Gitlab.config.gitlab.relative_url_root, "/", @project.path_with_namespace,
"/wikis"].join('')
And
rescue Gollum::NoSuchPathError
To
rescue Rugged::OSError
restart gitlab and bang, new projects have a working wiki when created. I
didn’t try forks, or if old project magically got them, but this will work for
new at the very least. Hope it helps.
