renovatebot: Extends from local presets

renovate.json

@@ -1,14 +1,7 @@
 {
   "$schema": "https://docs.renovatebot.com/renovate-schema.json",
-  "lockFileMaintenance": {
-    "enabled": true,
-    "automerge": true
-  },
-  "packageRules": [
-    {
-      "matchPackageNames": ["alpine", "golang.org/x/oauth2", "github.com/aws/aws-sdk-go", "github.com/ProtonMail/go-crypto"],
-      "automerge": true,
-      "automergeType": "branch"
-    }
+  "extends": [
+    "local>iac/renovate-config",
+    "local>iac/renovate-config//automerge-common"
   ]
 }