feat(ci): show test coverage

Author: chaimleib

.github/workflows/tests.yml

@@ -50,7 +50,7 @@ jobs:
         pip install -r requirements/pytest.txt
     - name: Test with pytest
       run: |
-        pytest
+        coverage run --source=. -m py.test
 
   flake8:
     runs-on: ubuntu-latest