use actions-gh-pages

.github/workflows/build.yml

@@ -36,14 +36,9 @@ jobs:
         emcc src/cpp/matrix.cpp -o build/matrix.js -lembind -std=c++17 -s WASM=2
 
     - name: Deploy to GitHub Pages
-      if: github.ref == 'refs/heads/main'
-      run: |
-        git config --global user.name 'github-actions[bot]'
-        git config --global user.email 'github-actions[bot]@users.noreply.github.com'
-        git clone --depth 1 --branch gh-pages https://github.com/${{ github.repository }} gh-pages
-        rsync -av --delete build/ gh-pages/
-        cd gh-pages
-        git add .
-        git commit -m 'Deploy to GitHub Pages'
-        git push origin gh-pages
-            
+      uses: peaceiris/actions-gh-pages@v3
+      with:
+        github_token: ${{ secrets.GITHUB_TOKEN }}
+        publish_dir: ./build
+        publish_branch: gh-pages
+