Add type support to matrix_coturn_container_additional_volumes

.. and try to auto-switch between `bind` and `volume` depending on
whether there's a slash in the `src` path.

Fixes https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/2482

roles/custom/matrix-coturn/defaults/main.yml

@@ -39,7 +39,8 @@ matrix_coturn_systemd_required_services_list: ['docker.service']
 # A list of additional "volumes" to mount in the container.
 # This list gets populated dynamically at runtime. You can provide a different default value,
 # if you wish to mount your own files into the container.
-# Contains definition objects like this: `{"src": "/outside", "dst": "/inside", "options": "rw|ro|slave|.."}
+# Contains definition objects like this: `{"type": "bind", "src": "/outside", "dst": "/inside", "options": "readonly"}.
+# See the `--mount` documentation for the `docker run` command.
 matrix_coturn_container_additional_volumes: []
 
 # A list of extra arguments to pass to the container

roles/custom/matrix-coturn/templates/systemd/matrix-coturn.service.j2

@@ -35,7 +35,7 @@ ExecStart={{ devture_systemd_docker_base_host_command_docker }} run --rm --name
 			{% endif %}
 			--mount type=bind,src={{ matrix_coturn_config_path }},dst=/turnserver.conf,ro \
 			{% for volume in matrix_coturn_container_additional_volumes %}
-			--mount type=bind,src={{ volume.src }},dst={{ volume.dst }}{{ (',' + volume.options) if volume.options else '' }} \
+			--mount type={{ volume.type | default('bind' if '/' in volume.src else 'volume') }},src={{ volume.src }},dst={{ volume.dst }}{{ (',' + volume.options) if volume.options else '' }} \
 			{% endfor %}
 			{% for arg in matrix_coturn_container_extra_arguments %}
 			{{ arg }} \