Pin down postgres version

[Lusitaniae]

The role is currently trying to configure postgres 11 for Debian based distros

However Ubuntu 20.x has v12 in the repositories

and Ubuntu 21.x have v13

https://packages.ubuntu.com/search?keywords=postgresql

  Debian: /var/lib/postgresql/11

  Debian: /etc/postgresql/11/main

Also

• the Gitlab CI jobs are timing out at 1h run time

• "create postgres database" and "create postgres users" don't have port argument
  port: "{{ postgres_port }}"
  so if I define non default port these tasks won't work