ci: fail job on upload failure

Author: jamesbhobbs

.github/workflows/build.yml

@@ -60,7 +60,7 @@ jobs:
         with:
           token: ${{ secrets.CODECOV_TOKEN }}
           files: coverage.xml,coverage/lcov.info
-          fail_ci_if_error: false
+          fail_ci_if_error: true
 
       - name: Upload test results to Codecov
         if: '!cancelled()'