Add basic coverage reporting to unit tests

Author: Themitchell

.github/workflows/stage-2-test.yaml

@@ -46,7 +46,9 @@ jobs:
           make test-unit
       - name: "Save the result of fast test suite"
         run: |
-          echo "Nothing to save"
+          docker cp lung_cancer_screening-web:/tmp/coverage.xml ./coverage.xml
+
+
   test-lint:
     name: "Linting"
     runs-on: ubuntu-latest

.gitignore

@@ -20,3 +20,4 @@ lung_cancer_screening/assets/compiled/*
 .venv
 .devcontainer/ca.crt
 tests/TEST-*.xml
+.coverage