minor adjustment of the build.yml file trying to fix actions

Author: jrzaurin

.github/workflows/build.yml

@@ -75,6 +75,9 @@ jobs:
     - name: Download all artifacts
       # Downloads coverage1, coverage2, etc.
       uses: actions/download-artifact@v4
+    - name: List downloaded files
+      run: |
+        ls -R coverage-files
     - name: Convert coverage
       run: |
         coverage combine coverage-files/*/.coverage*