Currently, there is both dnf and dnf5 in Fedora. dnf5 provides `dnf`,
but matching a package name is stronger and so requesting `dnf` here
still pulls in the legacy one.
This notably drops out Python from tier 0.
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