ci: Expose built RPMs as artifacts
Expose the artifacts from the centos-stream-8/9 and fedora 35/36 jobs so that the main libvirt integration testing project can consume them.
The new libvirt sub-rpm containing a python helper to access QMP directly requires python environment which we didn't yet install in the integration job.
Signed-off-by: Peter Krempa pkrempa@redhat.com