Run tripleo-build-containers-ubi-8 on BuildahBuilder code
Run tripleo-build-containers-ubi-8 on BuildahBuilder code

When patching the BuildahBuilder, it would be nice to get feedback from
the tripleo-build-containers-ubi-8 job as well, it provides quick
results on how we build the images with Buildah.

Change-Id: I99a05d14373976fb178b8d5822a854ccf786d231

openstack/tripleo-common,openstack/tripleo-common