Add Quarto GitHub Actions workflow for site build and deployment

Author: stemangiola

.github/workflows/quarto-website.yml

@@ -0,0 +1,64 @@
+name: Quarto Blog
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  build:
+    name: Check & Preview Build
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Check out repository
+        uses: actions/checkout@v3
+
+      - name: Set up Quarto
+        uses: quarto-dev/quarto-actions/setup@v2
+
+      - name: Install R (minimal)
+        uses: r-lib/actions/setup-r@v2
+        with:
+          use-public-rspm: true
+
+      - name: Render site (with code freeze)
+        run: quarto check && quarto render
+        
+      - name: Install xmllint
+        run: sudo apt-get update && sudo apt-get install -y libxml2-utils
+
+      - name: Validate RSS feed
+        run: |
+          if [ -f _site/index.xml ]; then
+            xmllint --noout _site/index.xml
+          else
+            echo "RSS feed not found!" && exit 1
+          fi
+
+  deploy:
+    if: github.event_name == 'push' && github.ref == 'refs/heads/main'
+    name: Publish to GitHub Pages
+    needs: build
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+
+    steps:
+      - name: Check out repository
+        uses: actions/checkout@v3
+
+      - name: Set up Quarto
+        uses: quarto-dev/quarto-actions/setup@v2
+
+      - name: Publish
+        uses: quarto-dev/quarto-actions/publish@v2
+        with:
+          target: gh-pages
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}