feat: add workflow to preview prs

.github/workflows/preview-pr.yml

@@ -0,0 +1,30 @@
+name: Preview Hugo Site
+
+on:
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  build-and-deploy:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Set up Hugo
+        uses: peaceiris/actions-hugo@v3
+        with:
+          hugo-version: '0.120.4'
+
+      - name: Build the site
+        run: hugo --minify
+
+      - name: Deploy to GitHub Pages
+        uses: peaceiris/actions-gh-pages@v3
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          publish_dir: ./public
+          # Deploy to a subdirectory for each PR
+          destination_dir: "preview/${{ github.event.number }}-${{ github.sha }}"