Add pgpass file to db_admin
Add pgpass file to db_admin

This will allow a user to connect to the instance by running:

`sudo -i psql`

This is similar in the behaviour to MySQL.

alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet