This helps people who run federation on another domain (etc.).
They should now easily be able to add a custom rule for federation traffic.

This allows people wishing to change or unset the resolver,
to have a single variable which they can toggle.

Unsetting the resolver is useful for using your own certificates
(not coming from a certificate resolver).

Update irc appservice

Fixes https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/2522

Fix documentation when fronting traefik with another reverse proxy

update mautrix-telegram 0.12.2 -> 0.13.0

Fix typo in changelog

Change documentation for host bind port when fronting traefik with another reverse proxy

fix postgres version detection in the borg role

Update ntfy 2.0.1 -> 2.1.0

Fixes a regression introduced in 0220c851e8

Add rageshake server

BuildX is required for building this container image.

There are no arm64 images published.. yet

This makes it consistent with the rest of the playbook:
- there's a default config which has various variables controlling
  settings
- there's also an `_extension_yaml` variable, which lets you override it

We disable it via `group_vars/matrix_servers`, as we do for all other
roles.