Add PR preview workflow using GitHub Actions

.github/workflows/pr-preview.yml

@@ -0,0 +1,37 @@
+name: PR Preview Deployment
+
+on:
+  pull_request:
+    branches:
+      - main  # Trigger on PRs targeting the main branch
+
+jobs:
+  deploy-preview:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v3
+
+      - name: Setup Ruby
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: '3.1'
+          bundler-cache: true
+
+      - name: Install dependencies
+        run: |
+          gem install bundler
+          bundle install
+
+      - name: Build site
+        run: bundle exec jekyll build --destination ./_site
+
+      - name: Deploy PR Preview
+        uses: peaceiris/actions-gh-pages@v3
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          publish_dir: ./_site
+          publish_branch: gh-pages
+          allow_empty_commit: true
+          cname: '' # Omit custom domain for PR previews