ci: Compute coverage only on src/

Author: thomass-dev

.github/workflows/backend.yml

@@ -85,9 +85,7 @@ jobs:
         if: ${{ matrix.coverage }}
         timeout-minutes: 10
         working-directory: skore/
-        run: |
-          mkdir coverage
-          python -m pytest -n auto --junitxml=coverage/coverage.xml --cov=skore src/ tests/ | tee coverage/coverage.txt
+        run: python -m pytest -n auto --cov=skore tests/
 
       - name: Upload coverage reports
         if: ${{ matrix.coverage && (github.event_name == 'pull_request') }}