ansible-core>=2.19.0 only auto-parses YAML files, not JSON.

Previous ansible-core versions auto-parsed JSON as well, but ansible-core>=2.19.0
doesn't, so we added a `from_json` post-filter.
However, older versions auto-parsing JSON and turning it into a dict, on
which we later run `from_json` is no good.

In this patch, we try to equalize behavior and configure Ansible to never parse JSON,
hopefully making old-Ansible behave like new Ansible.

Related to https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/4458

Ref: https://docs.ansible.com/ansible/latest/collections/ansible/builtin/template_lookup.html#parameter-convert_data

Related to https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/4445

It seems like ansible-core 2.19.0 no longer automatically parses template lookup content
as JSON (into a dict) when dealing with template files (be it `file.json.j2` or `file.j2`).

For files detected to contain YAML (`.ya?ml.j2`, but possibly others),
it automatically parses YAML, because the `convert_data` option
for the template lookup defaults to `true`.
Ref: https://docs.ansible.com/ansible/latest/collections/ansible/builtin/template_lookup.html

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

This commit adds copyright attributions in SPDX to the files for matrix-client-hydrogen following REUSE's specification.

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

This:

- brings consistency - no more mixing `_name_prefix` and `_registry_prefix`
- adds extensibility - a future patch will allow reconfiguring all registry prefixes for all roles in the playbook

We still have `_docker_` vs `_container_` inconsistencies.
These may be worked on later.

Related to 0241c71a4c

Related to https://github.com/spantaleev/matrix-docker-ansible-deploy/pull/3270#issuecomment-2143782962

With this change, it should be possible for people to adjust the Docker
dependency from `docker.service` to something else (e.g. `pkg-ContainerManager-dockerd.service`),
or to completely eliminate it by setting `devture_systemd_docker_base_docker_service_name` to an empty string.

This makes it easier for people to use the playbook against a Synology DSM server.

Fixes https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/3333

Putting each client into its own network was good for isolation,
but it's quite wasteful in terms of the container network pool.

`always` is an nginx suffix, which shouldn't have been added to these.

Previously, it had to go through matrix-nginx-proxy.
It's exposed to Traefik directly via container labels now

Serving at a path other than `/` doesn't work well yet.

This paves the way for installing other roles into `roles/galaxy` using `ansible-galaxy`,
similar to how it's done in:

- https://github.com/spantaleev/gitea-docker-ansible-deploy
- https://github.com/spantaleev/nextcloud-docker-ansible-deploy

In the near future, we'll be removing a lot of the shared role code from here
and using upstream roles for it. Some of the core `matrix-*` roles have
already been extracted out into other reusable roles:

- https://github.com/devture/com.devture.ansible.role.postgres
- https://github.com/devture/com.devture.ansible.role.systemd_docker_base
- https://github.com/devture/com.devture.ansible.role.timesync
- https://github.com/devture/com.devture.ansible.role.vars_preserver
- https://github.com/devture/com.devture.ansible.role.playbook_runtime_messages
- https://github.com/devture/com.devture.ansible.role.playbook_help

We just need to migrate to those.