ci: Enable relative config path tests

Author: dbanty

.github/workflows/checks.yml

@@ -62,7 +62,9 @@ jobs:
         run: poetry run pylint openapi_python_client
 
       - name: Run pytest
-        run: poetry run pytest --cov=openapi_python_client --cov-report=term-missing tests end_to_end_tests/test_end_to_end.py
+        run: poetry run pytest --cov=openapi_python_client --cov-report=term-missing tests end_to_end_tests/test_end_to_end.py --basetemp=tests/tmp
+        env:
+          TASKIPY: true
 
       - name: Generate coverage report
         shell: bash