add renovate CI

.forgejo/workflows/renovate.yml

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+name: Renovate
+
+on:
+  schedule:
+    - cron: '0 */8 * * *'
+
+jobs:
+  renovate:
+    runs-on: docker
+    container: renovate/renovate@sha256:328686ec82a09ea7fc4326ac03a35dff926a7e85206d7f1b376d6002e04ef526
+    env:
+      RENOVATE_TOKEN: ${{ secrets.RENOVATE_TOKEN }}
+      GITHUB_COM_TOKEN: ${{ secrets.GH_NOPRIV_TOKEN }}
+      RENOVATE_GIT_PRIVATE_KEY: ${{ secrets.JOHNNY5_GPG_PRIVKEY }}
+      RENOVATE_PLATFORM: gitea
+      RENOVATE_ENDPOINT: ${{ github.server_url }}
+      RENOVATE_GIT_AUTHOR: 'Johnny5 <bot@snaile.de>'
+      LOG_LEVEL: debug
+
+    steps:
+      - uses: https://code.forgejo.org/actions/checkout@9bb56186c3b09b4f86b1c65136769dd318469633 # v4.1.2
+
+      - name: Renovate
+        run: renovate ${{ github.repository }}

.renovaterc.json

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+{
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+  "extends": ["config:best-practices"],
+  "enabledManagers": ["github-actions"]
+}