ci: use push.parallel
ci: use push.parallel

We know push images in //.

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

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