Dockerfile: Exporting CEPH_POINT_RELEASE in ENV
Dockerfile: Exporting CEPH_POINT_RELEASE in ENV

As per issue #937, it would be useful to let user scripts being able to
know what version of ceph is installed to have some conditional code.

Only the CEPH_POINT_RELEASE variable was missing.

Signed-off-by: Erwan Velu <dbf153a4f846e5c13692f4d75719ee25e7660abd@redhat.com>

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