Add pgaudit extension to packaged database for omnibus installs

Proposal

More customers are wanting to use the pgaudit extension with GitLab's packaged PostgreSQL database. This is difficult to do "after the fact" since GitLab's packaged PostgreSQL database is installed in a custom location and so requires the extension to be compiled.

It would make this things much easier for our customers if we could add this extension to the list of possible extensions so they can just activate and use it if needed.

Related support ticket: https://gitlab.zendesk.com/agent/tickets/511462 (Internal only)

Details

• Website: https://www.pgaudit.org/

• Source: https://github.com/pgaudit/pgaudit

• License: PostgreSQL

  This code is released under the PostgreSQL licence, as given at http://www.postgresql.org/about/licence/

Usage & documentation is present in project README including: Usage Considerations, Compatibility, Compilation.