Deploy PostgreSQL on Eglide

Summary:
The Quassel core requires a PostgreSQL server for medium to heavy
installations.

Ref. T1384

Test Plan:

$ psql --version
psql (PostgreSQL) 10.3 (Debian 10.3-2)

Reviewers: dereckson

Reviewed By: dereckson

Differential Revision: https://devcentral.nasqueron.org/D1526