/home/runner/work/typing/typing/./.github/actions/prepare-nodemodules/action.yml (Line: 17, Col: 7): Unexpected value 'shell'

GitHub.DistributedTask.ObjectTemplating.TemplateValidationException: The template is not valid. /home/runner/work/typing/typing/./.github/actions/prepare-nodemodules/action.yml (Line: 17, Col: 7): Unexpected value 'shell' at GitHub.DistributedTask.ObjectTemplating.TemplateValidationErrors.Check() at GitHub.Runner.Worker.ActionManifestManager.ConvertRuns(IExecutionContext executionContext, TemplateContext templateContext, TemplateToken inputsToken, String fileRelativePath, MappingToken outputs) at GitHub.Runner.Worker.ActionManifestManager.Load(IExecutionContext executionContext, String manifestFile)