Error when evaluating 'strategy' for job 'linux'. sagemath/sage/.github/workflows/docker.yml@ac1b242d1394b5c2af984f00bb9fe8b28081a45b (Line: 133, Col: 30): Error parsing fromJson,sagemath/sage/.github/workflows/docker.yml@ac1b242d1394b5c2af984f00bb9fe8b28081a45b (Line: 133, Col: 30): After parsing a value an unexpected character was encountered: d. Path '[2]', line 4, position 2.,sagemath/sage/.github/workflows/docker.yml@ac1b242d1394b5c2af984f00bb9fe8b28081a45b (Line: 133, Col: 30): Unexpected value ''