Gitlab over ceph

I saw info that gitlab is not good over ceph, but I need to build it.
Where can I find instructions how to construct from scratch using ceph?

In manuals I saw gitlab over mysql which do support ceph, but postgresql is recommended instead.
For postgresql there is pghoard for keeping logs and backups.

So, does only mysql go with ceph?
Or did I miss some instructions about postgresql? detailed info is preffered

Petr Malkov