add github action

.github/workflows/build.yml

@@ -0,0 +1,21 @@
+name: build
+
+on:
+  push:
+    branches: [ main ]
+
+jobs:
+  build:
+    runs-on: macos-11
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
+        with:
+          python-version: '3.10'
+      - run: 
+          python3 -m venv venv
+          source venv/bin/activate
+          pip install -r requirements.txt
+          pip install -r requirements-stage2.txt
+          ./scripts/build.sh