[kolla] multiple ceph backends

Hi,

I'm progressing in figuring out Kolla and I've hit another issue. On our regular setups, we happen to be using multiple Ceph backends in cinder. Each of those backend uses a differently named ceph config file (like ceph.conf and ceph-rep.conf). While adding a custom configuration to cinder.conf is pretty easy, what's the best way to ensure that my second ceph config file ends up in my containers at the correct path? I've considered using ansible to add the file after kolla has deployed but I doubt this would be permanent.