chore: Initial attempt at Renovate workflow

.gitea/workflows/renovate.yaml

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+name: renovate
+
+on:
+  workflow_dispatch: # allows the workflow to be run manually when desired
+    branches:
+      - main
+  schedule: # runs this workflow at the scheduled time (uses UTC, adjust for your timezone)
+    - cron: "0 12 * * *"
+  push: # runs this workflow when pushes to the main branch are made
+    branches:
+      - master
+
+jobs:
+  renovate:
+    runs-on: ubuntu-latest
+    container: ghcr.io/renovatebot/renovate:latest
+    steps:
+      - uses: actions/checkout@v4
+      - run: renovate
+        env:
+          RENOVATE_CONFIG_FILE: ${{ gitea.workspace }}/config.js
+          LOG_LEVEL: "debug"
+          RENOVATE_TOKEN: ${{ secrets.RENOVATE_TOKEN }}
+          GITHUB_COM_TOKEN: ${{ secrets.RENOVATE_GITHUB_TOKEN }} # optional

.renovate/config.json

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+module.exports = {
+	platform: 'gitea',
+	endpoint: 'https://code.spamasaurus.com/api/v1/', // set this to the url of your gitea instance
+	gitAuthor: 'Renovate Bot <gitea.danny@spamasaurus.com>', // set the email address to whatever email your gave this user in your gitea
+	username: 'srv.renovate',
+	autodiscover: true,
+	onboardingConfig: {
+		$schema: 'https://docs.renovatebot.com/renovate-schema.json',
+		extends: ['config:recommended'],
+	},
+	optimizeForDisabled: true,
+	persistRepoData: true,
+};