Use codecov only for informational purposes (#398)

* Use codecov only for informational purposes

The code coverage for a new patch/change is only shown for
informational purposes. It should not block any PR, rather it should be
a point to discuss about.

* Use one single run to be uploaded to codecov

.github/workflows/ci.yml

@@ -83,6 +83,7 @@ jobs:
 
       - name: Upload results to Codecov
         uses: codecov/codecov-action@v4
+        if: matrix.os == 'ubuntu-24.04'
         with:
           token: ${{ secrets.CODECOV_TOKEN }}
 

codecov.yml

@@ -6,10 +6,12 @@ coverage:
       default:
         target: auto
         threshold: 50%  # Allow more fluctuation
+        informational: true  # Do not fail CI; only provide information
     patch:
       default:
         target: auto
         threshold: 10%  # Stricter for new changes
+        informational: true  # Do not fail CI; only provide information
 
 comment:
   layout: "condensed_header, condensed_files, condensed_footer" # add "condensed_" to "header", "files" and "footer"