Expose test artifacts to the Gitlab CI interface

Make tests generate JUnit artifacts and expose them to the Gitlab CI UI.

test/Dockerfile

@@ -9,4 +9,4 @@ RUN python3 setup.py install
 
 ENV TEST_CONFIG=/test-config.yml
 ENV TEST_PARAMS=/src/float_integration_test/test-params.yml
-CMD ["pytest", "-v", "-junit_xml=/artifacts/pytest.xml", "float_integration_test"]
+CMD ["pytest", "-v", "--junitxml=/artifacts/pytest.xml", "float_integration_test"]