ceph-osd: Add CONTAINER_IMAGE env variable
ceph-osd: Add CONTAINER_IMAGE env variable

This environment variable was added in cb381b4 but was removed in
4d35e9e.
This commit reintroduces the change.

Signed-off-by: Dimitri Savineau <a50a620e679eed14f4e99998b821cea8884cf228@redhat.com>

ceph/ceph-ansible,ceph/ceph-ansible