Technical update
Zammad is being installed on virtual machines with Ubuntu 22.04 using ansible (for repeatability, compliance, etc…). Mainly inspired by https://github.com/hifis-net/ansible-role-zammad (thank you!)
Issue
Zammad, Elasticsearch and PostgreSQL are being installed on three different servers (redis might follow). Since Zammad has hard dependencies on elasticsearch, postgresql and other packages like redis, there is no way to install services on separate servers.
Solution
To solve it I am building dummy packages of the hard dependecies using equivs on the Zammad server. It is not perfect but makes installing Zammad on a cloud like environment possible.