On Mon, Oct 4, 2021 at 7:04 PM Matthew Miller
I think the primary problem here is that koji does support neither
external builders nor building on top of qemu emulation.
However, COPR *does* support building on emulated architectures
(that's how its armv7 and s390x support works there).
I think your wrong about koji not supporting external builders, rpmfusion koji
uses external builders.