Missing relation between vault and ceph-rgw

When generating a bundle with the command below creating openstack containers, `openstack container create `, does not work as expected because of the missing relation between vault and ceph-rgw.

```
./generate-bundle.sh --defaults --release yoga --openstack-dashboard --num-compute 3 --ceph --ceph-rgw --num-ceph-mons 3 --num-osds-per-host 3 --name mystack
```
Adding the relation
```
juju integrate ceph-rgw:certificates vault:certificates
```

Start with generate-bundle.sh and the provided bundle-generation command, then inspect the generated bundle's vault and ceph-rgw integration definitions. Confirm that the certificates relation is present and verify that creating an OpenStack container works with the generated bundle.

Written by the indexing model from the issue text.