Hello,
currently, there is a problem with building EPEL-8 packages because of
DNF bugs regarding modularity (see RHBZ 1758459).
The only known workaround is to use DNF with `best=False'. Even though
it is something you don't really want to use longterm, we are patching
mock configs epel-8-* chroots, so there can be at least some EPEL-8
building in Copr.
(I am doing the change right now, but it won't affect already
spined-up builders. It will take a while until they get recycled and
use new configuration)
Once the DNF issues get resolved, we are going to drop those patches
and use `best=True` again.
For additional information, please see RHBZ 1756681 and RHBZ 1758467.
Thank you for understanding,
Jakub