Add codecoverage upload

Author: MDUYN

.github/workflows/test.yml

@@ -88,7 +88,7 @@ jobs:
       - name: Run tests
         run: |
           source .venv/bin/activate
-          coverage run -m unittest discover -s tests
+          coverage run -m unittest discover -s tests --cov=<project-dir> --cov-report=xml
       #----------------------------------------------
       #             upload coverage stats
       #----------------------------------------------