There is some discussion of the same topic at What triggers a build of new app versions?. See specifically my suggestion at What triggers a build of new app versions? - #22 by sorenstoutner.
In addition, this is a topic that keeps coming back up, because the current design will never meet the needs and expectations of users. See, for example, Is the F-Droid build process currently broken? from almost four years ago with over 10K views.