Fix the coverage job (#136)

* try to remove .o files after unit test run in coverage job

* report size

* try azure

* pipe

* pr

* azure: build and run

* names

* use find to delete .o files

* remove azure config

.github/workflows/coverage.yml

@@ -36,6 +36,11 @@ jobs:
         run: cmake --build build --
       - name: Unit tests
         run: cmake --build build -- test
+      - name: Remove .o files
+        run: >
+          du -sh build
+          && find build -name *.o -delete
+          && du -sh build
       - name: Coverage
         run: >
           pip3 install gcovr