Upgrade image to PHP 7.2
Currently, the image still runs on PHP 5.6,
as previously Phabricator didn't support PHP 7.
In 2018, the last blockers for PHP 7 adoption
by Phabricator was addressed. DevCentral installation
tested Phabricator + PHP 7.1 then 7.2 with success.
It's stable and gives good performance.
As such, this change switches the image to PHP 7
too. That mainly offers three benefits:
- it's a supported PHP version
- it allows to connect to MySQL 8 and faster
- it's modern and faster
The change is transparent and doesn't require
any configuration change.
Test Plan: Tested with https://devcentral.nasqueron.org
Reviewed By: dereckson
Subscribers: Nasqueron Docker deployment squad
Tags: Docker images
Differential Revision: https://devcentral.nasqueron.org/D1922