add github action for quarto build

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: aborruso

.github/workflows/build.yml

@@ -0,0 +1,35 @@
+name: Build site
+
+on:
+  push:
+    branches: [main]
+    paths:
+      - "*.qmd"
+      - "*.scss"
+      - "_quarto.yml"
+      - "pubblicazioni/**"
+      - "immagini/**"
+  workflow_dispatch:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: quarto-dev/quarto-actions/setup@v2
+        with:
+          version: "1.7.32"
+
+      - name: Render
+        run: quarto render
+
+      - name: Commit docs
+        run: |
+          git config user.name "github-actions[bot]"
+          git config user.email "github-actions[bot]@users.noreply.github.com"
+          git add docs/
+          git diff --staged --quiet || git commit -m "render" && git push