chore: Create renovate_config_check.yaml (#1920) (#2795)

* chore: Create renovate_config_check.yaml
Source-Link: googleapis/synthtool@6612ab8
Post-Processor: gcr.io/cloud-devrel-public-resources/owlbot-java:latest@sha256:a6aa751984f1e905c3ae5a3aac78fc7b68210626ce91487dc7ff4f0a06f010cc

Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>

.github/.OwlBot.lock.yaml

@@ -1,4 +1,4 @@
-# Copyright 2023 Google LLC
+# Copyright 2024 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -13,5 +13,5 @@
 # limitations under the License.
 docker:
   image: gcr.io/cloud-devrel-public-resources/owlbot-java:latest
-  digest: sha256:81f75d962cd28b7ad10740a643b8069b8fa0357cb495b782eef8560bb7a8fd65
-# created: 2023-12-05T19:16:19.735195992Z
+  digest: sha256:a6aa751984f1e905c3ae5a3aac78fc7b68210626ce91487dc7ff4f0a06f010cc
+# created: 2024-01-22T14:14:20.913785597Z

.github/workflows/renovate_config_check.yaml

@@ -0,0 +1,25 @@
+name: Renovate Bot Config Validation
+
+on:
+  pull_request:
+    paths:
+      - 'renovate.json'
+
+jobs:
+  renovate_bot_config_validation:
+    runs-on: ubuntu-22.04
+
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v4
+
+    - name: Set up Node.js
+      uses: actions/setup-node@v3
+      with:
+        node-version: '20'
+
+    - name: Install Renovate and Config Validator
+      run: |
+        npm install -g npm@latest
+        npm install --global renovate
+        renovate-config-validator