BigBlueButton & Nextcloud:

- Switch to custom BBB Docker repository
- Externalize Coturn and Collabora by default
- Add dedicated 03_dependencies.yml for dependency handling
- Improve env templating with lowercased feature flags
- Add conditional healthcheck for Greenlight
- Refactor TURN/STUN/relay handling with role variable _BBB_COTURN_ROLE
- Extend Collabora/Greenlight dependency wiring in override file
- Nextcloud Talk: refine vars and enable/disable logic with separate plugin/service flags, add network_mode support and conditional nginx proxy block

Ref: https://chatgpt.com/share/68d741ff-a544-800f-9e81-a565e0bab0eb

roles/web-app-nextcloud/templates/docker-compose.yml.j2

@@ -34,7 +34,7 @@
 {% include 'roles/docker-container/templates/networks.yml.j2' %}
         ipv4_address: 192.168.102.69
 
-{% if NEXTCLOUD_TALK_INTERNAL_ENABLED %}
+{% if NEXTCLOUD_TALK_SERVICE_ENABLED %}
   talk:
 {% set container_port = NEXTCLOUD_TALK_PORT_INTERNAL %}
 {% include 'roles/docker-container/templates/base.yml.j2' %}
@@ -42,6 +42,8 @@
     image: "{{ NEXTCLOUD_TALK_IMAGE }}:{{ NEXTCLOUD_TALK_VERSION }}"
     container_name: {{ NEXTCLOUD_TALK_CONTAINER }}
     init: true
+    network_mode: {{ COTURN_NETWORK_MODE }}
+{% if NEXTCLOUD_TALK_NETWORK_MODE == 'bridge' %}
     ports:
       - {{ networks.internet.ip4 }}:{{ NEXTCLOUD_TALK_STUN_PORT }}:{{ NEXTCLOUD_TALK_INT_TURN_PORT }}/tcp
       - {{ networks.internet.ip4 }}:{{ NEXTCLOUD_TALK_STUN_PORT }}:{{ NEXTCLOUD_TALK_INT_TURN_PORT }}/udp
@@ -52,6 +54,7 @@
       default:
         ipv4_address: 192.168.102.68
 {% endif %}
+{% endif %}
 
 {% if NEXTCLOUD_WHITEBOARD_ENABLED %}
   whiteboard: