feat: adopt cephadm (#752)

diff --git a/playbooks/csi.yml b/playbooks/csi.yml
index 27d9c29..a0590fe 100644
--- a/playbooks/csi.yml
+++ b/playbooks/csi.yml
@@ -19,3 +19,6 @@
     - role: csi
       tags:
         - csi
+  environment:
+    CEPH_CONTAINER_IMAGE: "{{ cephadm_image | default('quay.io/ceph/ceph:v' + (ceph_version | default('18.2.1'))) }}"
+    CEPH_CONTAINER_BINARY: docker