This installs the necessary cogs to access the particular clearly_defined db instance.
```
$ psql service=staging-clearly-defined # guest user, read-only access
$ psql service=admin-staging-clearly-defined # clearly-define user access read/write access to the db schema
```
inventory [1] updated
Related to T2865
[1] https://inventory.internal.softwareheritage.org/virtualization/virtual-machines/90/