Goal: 

The goal of this story is to update the default cephadm Ceph container image and tag to point to v20 [1].
The effect of this change will be to automatically switch the upstream CI operators zuul based jobs to Tentacle.

[1] https://github.com/openstack-k8s-operators/ci-framework/blob/main/roles/cifmw_cephadm/defaults/main.yml#L13