D:\a\pyjson5\pyjson5\./.github/actions/build_linux_v2_setup\action.yml (Line: 17, Col: 7): Required property is missing: shell

D:\a\pyjson5\pyjson5\./.github/actions/build_linux_v2_setup\action.yml (Line: 19, Col: 7): Required property is missing: shell

D:\a\pyjson5\pyjson5\./.github/actions/build_linux_v2_setup\action.yml (Line: 21, Col: 7): Required property is missing: shell

D:\a\pyjson5\pyjson5\./.github/actions/build_linux_v2_setup\action.yml (Line: 23, Col: 7): Required property is missing: shell

GitHub.DistributedTask.ObjectTemplating.TemplateValidationException: The template is not valid. D:\a\pyjson5\pyjson5\./.github/actions/build_linux_v2_setup\action.yml (Line: 17, Col: 7): Required property is missing: shell,D:\a\pyjson5\pyjson5\./.github/actions/build_linux_v2_setup\action.yml (Line: 19, Col: 7): Required property is missing: shell,D:\a\pyjson5\pyjson5\./.github/actions/build_linux_v2_setup\action.yml (Line: 21, Col: 7): Required property is missing: shell,D:\a\pyjson5\pyjson5\./.github/actions/build_linux_v2_setup\action.yml (Line: 23, Col: 7): Required property is missing: 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)