Instead of re-symlinking every tier-0 manifest, just include the tier-0
manifest directly. That way, rpm-ostree will already know to resolve its
manifests within the tier-0 directory.
This is only useful for RHEL developers who want to build RHEL
containers in the Fedora host and requires a subscription. Keep it out
by default; one can always of course re-layer it in a derived build.
Jonathan Lebon