ci: add github actions

.github/renovate.json

@@ -0,0 +1,6 @@
+{
+  "extends": ["config:base"],
+  "dependencyDashboard": true,
+  "labels": ["renovate"],
+  "automerge": true
+}

.github/workflows/pages.yml

@@ -0,0 +1,44 @@
+# To get started with Astro see: https://docs.astro.build/en/getting-started
+name: Deploy Astro site to Pages
+
+on:
+  push:
+    branches: ['main']
+
+  # Allows you to run this workflow manually from the Actions tab
+  workflow_dispatch:
+
+# Sets permissions of the GITHUB_TOKEN to allow deployment to GitHub Pages
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
+# Allow only one concurrent deployment, skipping runs queued between the run in-progress and latest queued.
+# However, do NOT cancel in-progress runs as we want to allow these production deployments to complete.
+concurrency:
+  group: 'pages'
+  cancel-in-progress: false
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout your repository using git
+        uses: actions/checkout@v4
+
+      - name: Install, build, and upload your site
+        uses: withastro/action@v1
+        with:
+          node-version: 20
+
+  deploy:
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    runs-on: ubuntu-latest
+    needs: build
+    steps:
+      - name: Deploy to GitHub Pages
+        id: deployment
+        uses: actions/deploy-pages@v2