fix: use network_mode host for container networking

Nginx needs host network to proxy API requests to rag-backend

Jenkinsfile

@@ -54,8 +54,7 @@ services:
   rag-frontend:
     image: ${CI_REGISTRY}/${DOCKER_IMAGE}:latest
     container_name: rag-frontend
-    ports:
-      - "8080:80"
+    network_mode: host
     restart: unless-stopped
 DCOF
                     docker compose pull