We allow 'luminous' still for testing purpose, it could be also
useful if one already upgraded his cluster to PVE 6.0 / Buster but
not yet ceph and due to a incident needs to setup a new luminous node
on Buster to get healthy again. This is fabricated but not
unthinkable, as it costs nothing and isn't available for WebUI user
just keep it for now. Remove with a future point release though.
Use non-public repo for now, will be updated to testing soon.
Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>
