Github Actions: Run tests even if code style validation fails

The test suite will still fail, but we get all issues reported instead of just code style issues.

.github/workflows/run-tests.yml

@@ -45,6 +45,7 @@ jobs:
         flake8 picard --count --show-source --statistics
         isort --check-only --diff --recursive picard test
     - name: Test with pytest
+      if: always()
       run: |
         pip install pytest pytest-randomly pytest-cov
         pytest --verbose --cov=picard --cov-report xml:coverage.xml test