ci: add Control Center bootstrap script and RenovateBot workflow

.forgejo/workflows/renovate.yml

@@ -0,0 +1,25 @@
+name: RenovateBot
+
+on:
+  schedule:
+    # Run at 2:00 AM every day
+    - cron: '0 2 * * *'
+  workflow_dispatch:
+
+jobs:
+  renovate:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Self-hosted Renovate
+        uses: renovatebot/github-action@v40.1.11
+        env:
+          # Token needs permission to read/write repository contents and pull requests
+          RENOVATE_TOKEN: ${{ secrets.RENOVATE_TOKEN }}
+          # The platform needs to be explicitly defined for Forgejo/Gitea
+          RENOVATE_PLATFORM: "gitea"
+          RENOVATE_ENDPOINT: "https://your-forgejo-instance.local/api/v1"
+          # The repository format: owner/repo
+          RENOVATE_REPOSITORIES: "your-username/nix-config"