Added coverage report to ci pipeline
Now, we get a test coverage report with each test run, as for example in this one https://gitext.gfz-potsdam.de/dynamicexposure/the-engine/the-engine/-/jobs/54430
Now, we get a test coverage report with each test run, as for example in this one https://gitext.gfz-potsdam.de/dynamicexposure/the-engine/the-engine/-/jobs/54430