The workflow is not valid. .github/workflows/validate.yml (Line: 28, Col: 13): Unexpected symbol: '""'. Located at position 50 within expression: steps.changed-files.outputs.all_changed_files != "" .github/workflows/validate.yml (Line: 41, Col: 13): Unexpected symbol: '""'. Located at position 50 within expression: steps.changed-files.outputs.all_changed_files != ""