Fix coveralls in CI for python matrix versions

- Perform coverage/coveralls in CI for Python 2.7
- Correct coveralls flag name for Python 3.x

Author: lhelwerd

.github/workflows/ci.yml

@@ -56,7 +56,7 @@ jobs:
         if: "${{ success() }}"
         with:
           github-token: "${{ secrets.GITHUB_TOKEN }}"
-          flag-name: "python-${{ matrix.python }}"
+          flag-name: "python-${{ matrix.python-version }}"
           parallel: true
           format: cobertura
           files: coverage.xml
@@ -71,11 +71,20 @@ jobs:
         uses: actions/checkout@v5
       - name: Install package
         run: |
-          pip install --upgrade pip setuptools
+          pip install --upgrade pip setuptools coverage
           pip install .
       - name: Run tests (unittest)
         run: |
-          python -m unittest discover -v || true
+          make coverage
+      - name: Coveralls upload
+        uses: coverallsapp/github-action@v2
+        if: "${{ success() }}"
+        with:
+          github-token: "${{ secrets.GITHUB_TOKEN }}"
+          flag-name: "python-2.7"
+          parallel: true
+          format: cobertura
+          files: coverage.xml
       - name: Legacy note
         run: echo "Python 2.7 run completed (non-blocking)."