Urbackup-server docker image in rootless mode

I am running urbackup server installed on vm running Centos and I have no plans to change that in the near future, however as I am currently busy with some serious OpenShift deployments, it came to my mind to try our urbackup-server in our test cluster.
I have not deployed it yet, only checked if image is available and yes, it is, but pre-deployment validation gives me this well known warning:

Image uroni/urbackup-server runs as the root user which might not be permitted by your cluster administrator.

Would it be possible at all to build urbackup server capable of running rootless mode? I might give it a try anyway with root as I am cluster admin, but more and more customers theese days are asking for rootless option.