Change how config is loaded from env for testing

.github/workflows/python-tests.yml

@@ -19,7 +19,7 @@ jobs:
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip
-          pip install pytest pytest-cov
+          pip install pytest pytest-cov pytest-env
           if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
       - name: Test with pytest
         run: |