chore: consolidate local integration changes

deploy/templates/docker-compose.yaml

@@ -296,7 +296,10 @@ services:
       oathkeeper: { condition: service_started }
 
   gateway:
-    image: nginx:alpine
+    build:
+      context: ../..
+      dockerfile: ./userfront/Dockerfile
+      target: production
     container_name: ${COMPOSE_PROJECT_NAME}_gateway
     ports:
       - "${USERFRONT_PORT}:80"