configure renovate with a recurring action

.forgejo/workflows/renovate.yaml

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+name: Renovate Dependency Bot
+
+on:
+  schedule:
+    - cron: "0 3 * * *"
+  workflow_dispatch:
+
+jobs:
+  renovate:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: "18"
+
+      - name: Renovate
+        uses: github.com/renovatebot/github-action@v42.0.4
+        with:
+          token: ${{ secrets.RENOVATE_TOKEN }}
+        env:
+          LOG_LEVEL: info
+          RENOVATE_CONFIG_FILE: renovate.json
+          RENOVATE_ENDPOINT: ${{ vars.RENOVATE_ENDPOINT }}

renovate.json

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+{
+    "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+    "extends": [
+        "config:base"
+    ],
+    "pip_requirements": {
+        "fileMatch": [
+            "^pyproject\\.toml$"
+        ]
+    },
+    "dockerfile": {
+        "fileMatch": [
+            "^Dockerfile$"
+        ]
+    },
+    "github-actions": {
+        "fileMatch": [
+            "^\\.forgejo\\/workflows\\/.*\\.yml$"
+        ]
+    },
+    "labels": [
+        "dependencies"
+    ],
+    "lockFileMaintenance": {
+        "enabled": true
+    }
+}