test: Inspect generated coverage files as they are missing before upload

Author: m1so

.github/workflows/ci.yml

@@ -373,6 +373,14 @@ jobs:
           token: ${{ secrets.CODECOV_TOKEN }}
           flags: python-${{ matrix.python-version }}
 
+      - name: Debug - Check file before upload
+        if: steps.test-unit.outputs.coverage_generated == 'true'
+        run: |
+          echo "PWD: $(pwd)"
+          echo "Looking for .coverage file:"
+          ls -la .coverage || echo ".coverage not found"
+          find . -name ".coverage" -type f || echo "No .coverage found anywhere"
+
       - name: Upload coverage artifacts
         if: steps.test-unit.outputs.coverage_generated == 'true'
         uses: actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02 # v4