The workflow is not valid. .github/workflows/tests-py.yml (Line: 45, Col: 13): Unexpected symbol: '='. Located at position 13 within expression: matrix.os !== 'windows-latest' .github/workflows/tests-py.yml (Line: 48, Col: 13): Unexpected symbol: '='. Located at position 12 within expression: matrix.os=== 'windows-latest'