Allow users to specify one or more profiles projects (git repo refs and credentials) to import (as sort of parent profile projects) before generating projects from the derived profile project.

This would allow users to distribute profiles by dev teams/projects to avoid having to rebuild the entire profile hierarchy, every time a sub-tree or leaf is edited.

Of course, this makes it hard to propagate changes to children projects when profiles in parent projects change. This might require either using Jenkins pipelines with some external trigger (git) to rebuild the children projects.