Fail builds on test failure

.github/workflows/python-package.yml

@@ -40,7 +40,9 @@ jobs:
     - name: Safety checks
       run: safety check
     - name: Test with pytest and coverage
-      run: pytest --junitxml=pytest.xml --cov-report=term-missing:skip-covered --cov=mvt tests/ | tee pytest-coverage.txt
+      run: |
+        set -o pipefail
+        pytest --junitxml=pytest.xml --cov-report=term-missing:skip-covered --cov=mvt tests/ | tee pytest-coverage.txt
     - name: Pytest coverage comment
       continue-on-error: true # Workflows running on a fork can't post comments
       uses: MishaKav/pytest-coverage-comment@main