synapse: Add support for appservices and use secrets better

roles/synapse/templates/homeserver.yaml.j2

@@ -81,7 +81,7 @@ url_preview_ip_range_blacklist:
 
 turn_uris: {{ synapse_turn_uris }}
 {% if synapse_turn_uris | length > 0 %}
-turn_shared_secret: {{ synapse_turn_shared_secret }}
+turn_shared_secret_file: /run/secrets/turn-shared-secret
 {% endif %}
 turn_user_lifetime: 1d
 turn_allow_guests: false
@@ -109,4 +109,10 @@ autocreate_auto_join_rooms: false
 matrix_authentication_service:
   enabled: true
   endpoint: http://matrix-authentication-service:8080/
-  secret: "{{ service_podman_secrets['synapse-mas-homeserver-secret'] }}"
+  secret_path: /run/secrets/mas-homeserver-secret
+
+{% if synapse_appservices | length > 0 %}
+app_service_config_files:
+  - {{ _synapse_doublepuppet_registration_mount.destination }}
+  {{ _synapse_appservice_registration_mounts | map(attribute='destination') | to_nice_yaml | indent(2) }}
+{% endif %}