ci: cleanup for leftover
ci: cleanup for leftover

Sometimes we end up running on the same slave, let's make sure it gets
purged prior to build anything.

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

JrCs/ceph-docker,JrCs/ceph-docker,ceph/ceph-docker,JrCs/ceph-docker,ceph/ceph-docker