add coverage to workflows

Describe your changes

adds a unit test coverage report to the workflow

[ ] Examples are executing successfully
[ ] Created/updated unit tests. Code Coverage percentage on new code shall be >= 80%.
[ ] Created/updated integration tests.
[ ] Devcontainer can be opened successfully
[ ] Devcontainer can be opened successfully behind a corporate proxy
[ ] Devcontainer can be re-built successfully
[ ] Extended the documentation (e.g. README.md, CONTRIBUTING.md, Velocitas)