Test Coverage Visualization

Gitlab kann wohl schon länger die Testabdeckung in Merge Request visuell anzeigen.

• https://docs.gitlab.com/ee/user/project/merge_requests/test_coverage_visualization.html
• https://docs.gitlab.com/ee/ci/pipelines/job_artifacts.html#artifactsreportscobertura
• https://github.com/rix0rrr/cover2cover