add pytest workflow

.github/workflows/pytest.yml

@@ -0,0 +1,34 @@
+name: Test Python package with Poetry
+
+on: 
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  test:
+
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        python-version: [3.8, 3.9, 3.10, 3.11, 3.12]
+
+    steps:
+    - uses: actions/checkout@v3
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v3
+      with:
+        python-version: ${{ matrix.python-version }}
+    - name: Install Poetry
+      run: |
+        pip install poetry
+    - name: Install dependencies
+      run: |
+        poetry install
+    - name: Run tests
+      run: |
+        poetry run pytest test_calendar.py
+        poetry run pytest test_bizdays.py
+        poetry run pytest test_bizdays_pandas.py