feat(py3): automatically report tests status

templates/tests/py3.yml

@@ -3,5 +3,5 @@
   before_script:
     - pip install tox
   stage: tests
-  script: tox -e py3
+  script: tox -e py3 -- --junitxml=report.xml
   artifacts:
@@ -7,3 +7,6 @@
   artifacts:
+    when: always
+    reports:
+      junit: report.xml
     paths:
       - py3-deprecated-warnings.json