Add initial Renovate configuration file

Add Renovate configuration

renovate.json

@@ -0,0 +1,27 @@
+{
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+  "extends": [
+    "github>rancher/renovate-config//rancher-main#release"
+  ],
+  "prHourlyLimit": 2,
+  "prConcurrentLimit": 4,
+  "prCreation": "status-success",
+  "labels": ["dependencies"],
+  "packageRules": [
+    {
+      "description": "Group Go version updates",
+      "matchDatasources": ["golang-version"],
+      "labels": ["dependencies", "go-version"],
+      "prPriority": 10
+    },
+    {
+      "description": "Rancher API client updates",
+      "matchPackagePatterns": [
+        "github.com/rancher/norman",
+        "github.com/rancher/wrangler"
+      ],
+      "labels": ["dependencies", "rancher-api"],
+      "prPriority": 5
+    }
+  ]
+}