ci: Add Renovate config.

Author: octo

.github/workflows/renovate.yml

@@ -0,0 +1,21 @@
+name: Renovate
+on:
+  schedule:
+    # Run every Monday at 2:00 AM
+    - cron: '0 2 * * 1'
+  workflow_dispatch: # Allow manual triggering
+
+jobs:
+  renovate:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        
+      - name: Self-hosted Renovate
+        uses: renovatebot/github-action@v39.0.5
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          configurationFile: .renovate.json
+        env:
+          LOG_LEVEL: 'debug'

.renovate.json

@@ -0,0 +1,14 @@
+{
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+  "extends": [
+    "config:base"
+  ],
+  "schedule": ["before 5am on monday"],
+  "golang": {
+    "enabled": true
+  },
+  "postUpdateOptions": ["gomodTidy"],
+  "automerge": false,
+  "prHourlyLimit": 0,
+  "prConcurrentLimit": 0
+}