I don't know if this is what you are looking for, but we already are doing this without PAPR on PRs as part of the CI-Pipeline[1] in that same Openshift environment.
We actually rebuild our own containers and validate them with our pipeline code in a stage pipeline before they get rolled into production.[1]
Our master and slaves are already integrated into
apps.ci.centos.org and all the infrastructure and code is in[2]
I would like to avoid duplication of work if you guys are looking to the same thing and understand is there something that PAPR has over what we are currently doing for the ci-pipeline.
I would happy to discuss it with you in more detail.
Thanks,