add renovate for alpine

.github/workflows/renovate.yml

@@ -0,0 +1,26 @@
+name: Renovate
+on:
+  schedule:
+    - cron: '* */4 * * *'  # Runs every 4 hours
+  workflow_dispatch:
+  push:
+    branches:
+      - main
+      - deps_check
+
+jobs:
+  renovate:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Self-hosted Renovate
+        uses: renovatebot/[email protected]
+        with:
+          token: ${{ secrets.GH_TOKEN }}
+          configurationFile: renovate.json
+        env:
+          LOG_LEVEL: 'info'
+          RENOVATE_AUTODISCOVER: 'false'
+          RENOVATE_REPOSITORIES: ${{ github.repository }}

renovate.json

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+{
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+  "platform": "github",
+  "extends": ["config:base"],
+  "labels": ["version_bump"],
+  "forkProcessing": "enabled",
+  "semanticCommits": "enabled",
+  "dependencyDashboard": true,
+  "onboarding": true,
+  "automerge": false,
+  "separateMinorPatch": true,
+  "prConcurrentLimit": 20,
+  "prHourlyLimit": 20,
+  "dockerfile": {
+    "enabled": false
+  },
+  "customManagers": [
+    {
+      "customType": "regex",
+      "datasourceTemplate": "endoflife-date",
+      "depNameTemplate": "alpine",
+      "fileMatch": ["Makefile.variables"],
+      "matchStrings": ["alpine_version\\s*=\\s*(?<currentValue>\\S+)"],
+      "packageNameTemplate": "alpine",
+      "versioningTemplate": "semver"
+    }
+  ],
+  "customDatasources": {
+    "endoflife-date": {
+      "defaultRegistryUrlTemplate": "https://endoflife.date/api/alpine.json",
+      "format": "json"
+    }
+  }
+}