feat: add workflow to preview prs

.github/workflows/preview-pr.yml

@@ -0,0 +1,50 @@
+name: Preview Hugo Site
+
+on:
+  pull_request:
+    branches:
+      - main
+
+# Set permissions of the GITHUB_TOKEN to allow deployment to GitHub Pages
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
+# Allow only one concurrent deployment
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: false
+
+# Default to bash
+defaults:
+  run:
+    shell: bash
+
+jobs:
+  build-and-deploy:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Install Hugo CLI
+        env:
+          HUGO_VERSION: 0.120.4
+        run: |
+          wget -O ${{ runner.temp }}/hugo.deb https://github.com/gohugoio/hugo/releases/download/v${HUGO_VERSION}/hugo_extended_${HUGO_VERSION}_linux-amd64.deb \
+          && sudo dpkg -i ${{ runner.temp }}/hugo.deb
+
+      - name: Check out repo
+        uses: actions/checkout@v4
+        with:
+          submodules: recursive
+
+      - name: Build the site
+        run: hugo --minify
+
+      - name: Deploy to GitHub Pages
+        uses: peaceiris/actions-gh-pages@v4
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          publish_dir: ./public
+          # Deploy to a subdirectory for each PR
+          destination_dir: "preview/${{ github.event.number }}-${{ github.sha }}"