Attempt at fixing Codecov coverage analysis

Author: tleonhardt

.github/workflows/tests.yml

@@ -41,6 +41,22 @@ jobs:
       - name: Run isolated tests
         run: uv run inv pytest --junit --no-pty --isolated
 
-      - name: Upload coverage reports to Codecov with GitHub Action on Python 3.13 for each OS
-        uses: codecov/codecov-action@v3
-        if: ${{ matrix.python-version == '3.13' }}
+      - name: Upload test results to Codecov
+        if: ${{ !cancelled() }}
+        uses: codecov/test-results-action@v1
+        with:
+          files: ./junit.xml,!./cache
+          flags: python${{ matrix.python-version }}
+          name: codecov-umbrella-test-results
+          token: ${{ secrets.CODECOV_TOKEN }}
+      - name: Upload coverage to Codecov
+        uses: codecov/codecov-action@v4
+        with:
+          directory: ./coverage/reports/
+          env_vars: OS,PYTHON
+          fail_ci_if_error: true
+          files: ./coverage1.xml,./coverage2.xml,!./cache
+          flags: unittests
+          name: codecov-umbrella
+          token: ${{ secrets.CODECOV_TOKEN }}
+          verbose: true