fix: Add PYTHONPATH to pytest step in workflow

Author: Niraj Bajpai

.github/workflows/python-app.yml

@@ -35,5 +35,7 @@ jobs:
         # exit-zero treats all errors as warnings. The GitHub editor is 127 chars wide
         flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
     - name: Test with pytest
+      env:
+        PYTHONPATH: .
       run: |
         pytest