Fix pipeline

Author: matthewelwell

.github/workflows/pytest.yml

@@ -28,13 +28,13 @@ jobs:
               run: |
                   python -m pip install --upgrade pip
                   pip install poetry
-                  poetry install
 
             - name: Check Formatting
               run: | 
+                poetry shell
                 black --check .
                 flake8 .
                 isort --check .
 
             - name: Run Tests
-              run: pytest
+              run: poetry run pytest