Add Default DBO User

```yaml
  users:
    <INSTANCE>dbo:
    - superuser
    - createdb
  databases:
    <INSTANCE>db01: <INSTANCE>dbo
  preparedDatabases:
    <INSTANCE>prepdb01:
      defaultUsers: true
      extensions:
        pg_partman: public
        pgcrypto: public
      schemas:
        data: {}
        history:
          defaultRoles: true
          defaultUsers: false

```