add github workflow

Author: yennanliu

.github/workflows/deploy-cheatsheet.yml

@@ -0,0 +1,37 @@
+# .github/workflows/deploy-cheatsheet.yml
+
+name: Deploy Cheatsheet to GitHub Pages
+
+on:
+  push:
+    branches: [ main ]  # Or your default branch
+    paths:
+      - 'doc/cheatsheet/**'
+
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
+concurrency:
+  group: 'pages'
+  cancel-in-progress: true
+
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout Repository
+        uses: actions/checkout@v3
+
+      - name: Setup Pages
+        uses: actions/configure-pages@v3
+
+      - name: Upload Cheatsheet files
+        uses: actions/upload-pages-artifact@v2
+        with:
+          path: doc/cheatsheet
+
+      - name: Deploy to GitHub Pages
+        uses: actions/deploy-pages@v2