ci: add GitHub Actions workflow for Python testing

.github/workflows/ci.yml

@@ -0,0 +1,44 @@
+name: CI
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    env:
+      QUIP_TOKEN: ${{ secrets.QUIP_TOKEN }}
+      QUIP_BASE_URL: ${{ secrets.QUIP_BASE_URL }}
+      TEST_THREAD_ID: ${{ secrets.TEST_THREAD_ID }}
+      TEST_SHEET_NAME: ${{ secrets.TEST_SHEET_NAME }}
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: '3.12'
+
+      - name: Upgrade pip
+        run: python -m pip install --upgrade pip
+
+      - name: Install project dependencies
+        run: pip install .
+
+      - name: Install pytest
+        run: pip install pytest
+
+      - name: Show Python version and installed packages
+        run: |
+          python --version
+          pip list
+
+      - name: Run unit tests
+        run: pytest tests
+
+      - name: Run e2e tests
+        run: pytest tests/e2e