Change custom config to be overridable

Make setup for automatic updates optional through UPDATES variable

Fix remaining references to PostgreSQL 10

Merge branch 'Y0ngg4n-postgresql-12-upgrade'

Add proper handling of docker stop

Merge pull request Overv#71 from stevo01/master

use carto version 0.18.2 to solve carto conflicts / warnings

Update instructions for flat node usage

Fix Postgres not being reachable from outside container

Improve compatibility of Apache logging locations

Add ALLOW_CORS parameter