nextcloud:whiteboard: wait for Redis before start (depends_on: service_healthy) to prevent early SocketClosedUnexpectedlyError

Context: added depends_on on redis for the Whiteboard service so websockets don’t crash when Redis isn’t ready yet. See discussion: https://chatgpt.com/share/68f65a3e-aa54-800f-a1a7-e6878775fd7e

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

@@ -79,6 +79,9 @@
     networks:
       default:
         ipv4_address: 192.168.102.71
+    depends_on:
+      redis:
+        condition: service_healthy
 {% endif %}