Allow PR coverage comment to fail if running on a fork (#427)

.github/workflows/python-package.yml

@@ -42,8 +42,9 @@ jobs:
     - name: Test with pytest and coverage
       run: 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
       if: github.event_name == 'pull_request'
       with:
         pytest-coverage-path: ./pytest-coverage.txt
-        junitxml-path: ./pytest.xml
+        junitxml-path: ./pytest.xml