Several improvements (see below); New default: Only last 3 speakers will be have active video

- Remove Jitsi runtime config in case of Ansible tag teardown
- Performance: DefautSet Jitsi Web config channelLastN using jitsi_web_channel_last_n
- Adds submodule with the source of docker-jitsi-meet, which this role is based on.

tasks/main.yml

@@ -8,6 +8,12 @@
     group: '{{ docker_user }}'
   tags: config
 
+- name: "Teardown: Remove Jitsi runtime config"
+  file:
+    path: /home/{{ docker_user }}/jitsi/conf
+    state: absent
+  tags: ['never', 'teardown']
+
 - name: Ensure jitsi config directory exists
   file:
     path: /home/{{ docker_user }}/jitsi/conf
@@ -67,6 +73,14 @@
     host: localhost
     port: "{{ jitsi_exposed_http_port }}"
 
+- name: "Config: Set channelLastN"
+  lineinfile:
+    path: /home/{{ docker_user }}/jitsi/conf/web/config.js
+    regexp: '(\s*)channelLastN:\s*[^,]+,'
+    line: '\1channelLastN: {{jitsi_web_channel_last_n|default("-1")}},'
+    backrefs: yes
+  tags: config
+
 - name: "Test whether Jitsi is healthy from the outside"
   become: false
   uri: