Fail CI if codecov generates an error

Author: urfeex

.github/workflows/ci.yml

@@ -60,7 +60,7 @@ jobs:
       - name: Upload coverage to Codecov
         uses: codecov/codecov-action@v5
         with:
-          gcov: true
+          fail_ci_if_error: true
           token: ${{ secrets.CODECOV_TOKEN }}
       - name: Generate URSim log files
         if: always()