[ceph-users] Deploy custom mgr module

Is there a simple way to deploy a custom (in-house) mgr module to an orchestrator managed cluster? I assume the module code would need to be included in the mgr container image. However, there doesn't seem to be a straightforward way to do this without having the module merged to upstream ceph (not possible for a custom/in-house solution) or maintaining an in-house container repository and custom container images (a lot of extra maintenance overhead). Also, what's the best way to handle testing during development? Custom scripts to push the code into to a mgr container in a dev cluster?