Add PYTHONPATH

Author: attdona

.github/workflows/python-app.yml

@@ -36,6 +36,8 @@ 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: ${{ github.workspace }}/src
       run: |
         pytest
     - name: Upload coverage to Codecov