Comment 1 for bug 2002371

I originally hit this because I had commented out the only option in an overlay

ubuntu@lathiat-bastion:~/stsstack-bundles/openstack$ cat ../overlays/vault-openstack-secrets.yaml
applications:
  nova-compute:
    options:
# encrypt: True
    storage:
      ephemeral-device: cinder,32G,1
relations:
  - ['nova-compute:secrets-storage', 'vault:secrets']