Cleanup code coverage to only include our header

Author: cschreib

.github/workflows/cmake.yml

@@ -71,4 +71,7 @@ jobs:
 
     - name: Compute Code Coverage
       if: runner.os == 'Linux' && ${{matrix.platform.compiler}} == 'g++' && ${{matrix.build-type}} == 'Debug'
-      run: gcov ${{github.workspace}}/build/tests/CMakeFiles/oup_tests.dir/runtime_tests.cpp.gcda && bash <(curl -s https://codecov.io/bash)
+      run: |
+        gcov ${{github.workspace}}/build/tests/CMakeFiles/oup_tests.dir/runtime_tests.cpp.gcda
+        ls | grep '.gcov' | grep -v observable_unique_ptr | xargs -d"\n" rm
+        bash <(curl -s https://codecov.io/bash)