Signed-off-by: Suguru Hirahara <acioustick@noreply.codeberg.org>

Also removes the FIX ME for Polling as well it being broken in the playbook is no longer true.

Ref:

- https://github.com/spantaleev/matrix-docker-ansible-deploy/pull/4326
- https://github.com/matrix-org/matrix-hookshot/releases/tag/7.0.0
- https://github.com/matrix-org/matrix-hookshot/pull/931

Closes https://github.com/spantaleev/matrix-docker-ansible-deploy/pull/4326

Ref: 91986a129c/CHANGELOG.md (2025-05-11-version-172)

Ref:

- d2660be33c/CHANGELOG.md (2025-05-10-version-170)
- https://openai.com/index/image-generation-api/

Ref: d2660be33c/CHANGELOG.md (2025-05-10-version-170)

Supersedes https://github.com/spantaleev/matrix-docker-ansible-deploy/pull/4284

Fixes https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/4297

Supersedes https://github.com/spantaleev/matrix-docker-ansible-deploy/pull/4300

This works around an issue with Matrix Authentication Service's `syn2mas` sub-command (at version v0.16.0),
which chokes with an error:

> Error: Failed to load Synapse configuration
> Caused by:
> invalid type: found unit, expected struct EnableableSection for key "default.cas_config" in homeserver.yaml YAML file

This issue is likely to be fixed in MAS v0.16.1 or v0.17.0.

refers to commit
  e65d19884 Run Element Web in tightened/read-only mode without a custom nginx config

and issue
  https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/4199

This is a backward-incompatible change. By default, Ansible creates
users with (e.g.) `/bin/sh` on Linux, so changing to a no shell
leads to different behavior.

That said, it appears that using a shell-less user works OK with regard
to Ansible execution and starting the systemd services/containers later on.

We create the `matrix` user as a system user (smaller uid), so it makes
sense to do the same for the `matrix` group.

This defaults to `true`, as before.