Add GitHub Pages workflow to build and publish Typst write-up PDF

.github/workflows/writeup-pages.yml

@@ -0,0 +1,69 @@
+name: Build and Deploy Writeup
+
+on:
+  push:
+  pull_request:
+  workflow_dispatch:
+
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
+concurrency:
+  group: pages
+  cancel-in-progress: true
+
+jobs:
+  build-writeup:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Typst
+        uses: typst-community/setup-typst@v4
+
+      - name: Build PDF
+        run: |
+          mkdir -p site
+          typst compile --root . WriteUp/main.typ site/main.pdf
+
+      - name: Add index page
+        run: |
+          cat > site/index.html <<'HTML'
+          <!doctype html>
+          <html lang="en">
+            <head>
+              <meta charset="utf-8" />
+              <meta name="viewport" content="width=device-width, initial-scale=1" />
+              <title>PNN_S Write-up</title>
+              <style>
+                body { margin: 0; font-family: system-ui, sans-serif; }
+                object { width: 100vw; height: 100vh; border: 0; }
+              </style>
+            </head>
+            <body>
+              <object data="main.pdf" type="application/pdf">
+                <p>Open the write-up: <a href="main.pdf">main.pdf</a></p>
+              </object>
+            </body>
+          </html>
+          HTML
+
+      - name: Upload pages artifact
+        uses: actions/upload-pages-artifact@v3
+        with:
+          path: site
+
+  deploy:
+    if: github.event_name == 'push' && github.ref_name == github.event.repository.default_branch
+    needs: build-writeup
+    runs-on: ubuntu-latest
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    steps:
+      - name: Deploy to GitHub Pages
+        id: deployment
+        uses: actions/deploy-pages@v4