Allow UI customization

roles/jitsi/templates/compose.override.yaml.j2

@@ -8,6 +8,13 @@ networks:
     enable_ipv6: true
 
 services:
+{% if jitsi__web_files | length > 0 %}
+  web:
+    volumes:
+{% for file in jitsi__web_files %}
+      - {{ jitsi__base_dir }}/web-files/{{ file.path }}:/usr/share/jitsi-meet/{{ file.path }}:ro
+{% endfor %}
+{% endif %}
 {% if jitsi__turn %}
   coturn:
     image: docker.io/coturn/coturn:4.18.0
@@ -35,6 +42,6 @@ services:
     networks:
       meet.jitsi:
 {% endif %}
-{% if not (jitsi__turn or jitsi__prometheus_exporter) %}
+{% if not (jitsi__web_files or jitsi__turn or jitsi__prometheus_exporter) %}
   {}
 {% endif %}