ci: only change FROM when not kraken
ci: only change FROM when not kraken

Since Kraken the "base" image has disappeared so we now put a condition
on the sed and only sed if base exists.

Signed-off-by: Sébastien Han <62d754cc350e84d3b1c32ae79f976f5348e74a40@redhat.com>

osixia/ceph-docker,JrCs/ceph-docker,mkkie/ceph-docker,cdxvirt/ceph-docker,rootfs/ceph-docker,JrCs/ceph-docker,AcalephStorage/ceph-docker,AcalephStorage/ceph-docker,JrCs/ceph-docker,osixia/ceph-docker,rootfs/ceph-docker,osixia/ceph-docker,ceph/ceph-docker,AcalephStorage/ceph-docker,ceph/ceph-docker,mkkie/ceph-docker,cdxvirt/ceph-docker