add Renovate configuration file and update workflow to use it

.github/workflows/renovate-config.js

@@ -0,0 +1,12 @@
+module.exports = {
+  username: 'renovate-release',
+  gitAuthor: 'Renovate Bot <bot@renovateapp.com>',
+  onboarding: false,
+  platform: 'github',
+  repositories: ['aggarwalakshun/k3s'],
+  autodiscover: false,
+  onboardingConfig: {
+    $schema: 'https://docs.renovatebot.com/renovate-schema.json',
+    extends: ['config:recommended']
+  },
+};

.github/workflows/renovate.yml

@@ -17,3 +17,4 @@ jobs:
         uses: renovatebot/github-action@v43.0.17
         with:
           token: ${{ secrets.RENOVATE_TOKEN }}
+          configurationFile: rerenovate-config.js