ELN composes on mirrors

I had filed https://github.com/fedora-eln/eln/issues/33 a while ago to track documentation improvements around how to consume ELN composes.  I'd like to take a step back and propose adding them to the mirror network, akin to what we already do for Rawhide. This would make it trivial to consume or mirror them locally (e.g. via rsync), without having to hit ODCS directly. The only downside I can think of is that it'd consume a bit more storage on the mirrors themselves. Thoughts? Cheers Davide