I might have missed some documentation (or just knowledge of docker best practices and how to apply them) but...

What's the best way to add plugins to roundcube with this setup, so that it will survive updates, migrations etc?

I'm particularly interested in things like keyboard shortcuts, contact sync etc, but I expect if there's a "containery way" it would apply to all plugins.

It would

Feature: Well written, clear and formatted documentation.

Recommended approaches
Currently, Most of the configuration files and yml files have well put variable names and functionality. Unfortunately, explaining each choice and option has not been done well enough and what has been written, is written by a mathematics researcher with her very little experience in writing nicely formatted d

Make the scripts and Ansible playbooks use the changes here: hardware/mailserver@70d503f

Basically, create http_network docker network, and a modified docker-compose.yml file that uses traeffik.

As clamd already has support to run custom scripts.