Add renovate config file for helmRelease updates

.renovaterc.json

+{
+  "regexManagers": [
+    {
+      "fileMatch": ["flux2/.+release\\.yaml$"],
+      "matchStrings": [
+        "registryUrl=(?<registryUrl>.*?)\n *chart: (?<depName>.*?)\n *version: (?<currentValue>.*)\n"
+      ],
+      "datasourceTemplate": "helm"
+    }
+  ],
+  "python": {
+    "enabled": false
+  }
+}