Fix cephadm image tag conditional error

Ansible facts are not guaranteed to be available when the
cephadm_image_tag value needs to be evaluated. This change makes it
conditional on the os_release instead.

Author: Alex-Welsh

etc/kayobe/cephadm.yml

@@ -12,7 +12,7 @@ cephadm_ceph_release: "{{ 'quincy' if (ansible_facts['distribution_release'] ==
 cephadm_image: "{{ stackhpc_docker_registry if stackhpc_sync_ceph_images | bool else 'quay.io' }}/ceph/ceph:{{ cephadm_image_tag }}"
 
 # Ceph container image tag.
-cephadm_image_tag: "{{ 'v17.2.6' if ansible_facts['distribution_release'] == 'jammy' else 'v16.2.11' }}"
+cephadm_image_tag: "{{ 'v17.2.6' if os_release == 'jammy' else 'v16.2.11' }}"
 
 # Ceph custom repo workaround for Ubuntu Jammy as there are no official ceph repos for jammy.
 cephadm_custom_repos: "{{ ansible_facts['distribution_release'] == 'jammy' }}"