chore(ci): add Renovate workflow

.gitea/workflows/renovate.yml

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+name: RenovateBot
+
+on:
+  schedule:
+    - cron: "@daily"
+  push:
+    branches:
+      - trunk
+
+jobs:
+  renovate:
+    container: ghcr.io/renovatebot/renovate:44
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v7
+      - name: Run renovate
+        run: renovate
+        env:
+          RENOVATE_GITHUB_COM_TOKEN: ${{ secrets.RENOVATE_GITHUB_COM_TOKEN }}
+          RENOVATE_CONFIG_FILE: renovate.config.cjs
+          RENOVATE_REPOSITORIES: ${{ gitea.repository }}
+          RENOVATE_TOKEN: ${{ secrets.RENOVATE_TOKEN }}

renovate.config.cjs

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+module.exports = {
+  endpoint: "https://code.popov.link",
+  platform: "gitea",
+};

renovate.json

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+{
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+  "extends": ["config:recommended"]
+}