I've started [1], didn't got time to finish it though,
But the idea is to allow anyone who wants to build artifacts from a patch to do so by add comment "ci please build".
There is already an open Jira on it [2], though maybe its not exactly the same use case.
I was suggestion what you are saying as preparation for automating official builds, but we didn't got around to do it yet,
and currently the focus and priority is on oVirt Gating, but if its something simple like [1] we can probably work with developers to add it if it has lot of value.
Lets star with [1] and see if it answer some of the existing needs.