add Node.js version tracking to Renovate

Dockerfile

@@ -3,7 +3,8 @@
 # Optimized for HF Spaces free tier (2 vCPU, 16GB RAM, 50GB disk)
 # =============================================================================
 
-FROM node:24-alpine
+ARG NODE_VERSION=24
+FROM node:${NODE_VERSION}-alpine
 
 # Install system dependencies
 RUN apk add --no-cache \

renovate.json

@@ -14,6 +14,18 @@
       ],
       "depNameTemplate": "n8n",
       "datasourceTemplate": "npm"
+    },
+    {
+      "customType": "regex",
+      "managerFilePatterns": [
+        "/^Dockerfile$/"
+      ],
+      "matchStrings": [
+        "ARG NODE_VERSION=(?<currentValue>\\d+)\\n"
+      ],
+      "depNameTemplate": "node",
+      "datasourceTemplate": "docker",
+      "versioningTemplate": "docker"
     }
   ],
   "packageRules": [