For the info, I've restored the capability to build for multilibs on
fedora 31+ (as we don't build i686 by default). There is a rfpkg
update that is been prepared by sergio to automate the appropriate
packages to be forwarded to the related koji build target.
The current packages that will build on multilibs are currently
limited to steam, libva-intel-driver and nvidia driver. If other
components are missing, please let me know.
For the long run, it's more complicated as i386 repos doesn't seem to
be published (el8) or are going to be less reliable (fedora 31+). So
instead, I envision to build using the x86_64 repos (using a x86_64
compiler and tools and i686 libraries).
For information, RHEL8 is obviously building i686 with -m32
-march=x86_64 by default, so I assume the i686 packages are already
built using a x86_64 userspace there.
I've reported this issue to mock to investigate how this can be achieved: