Add the `gce` image type intended for Google Compute Engine. The image
is BYOS - bring your own subscription and requires registering in order
to access Red Hat content.
Signed-off-by: Tomas Hozza <thozza@redhat.com>
Add rpmrepo repositories for testing.
Symlink centos-9 to centos-stream-9.
Add rpmrepo snapshot repositories to test and
test-case-generator repos.
Remove unused repositories from cs9 test repositories.