GitHub.DistributedTask.ObjectTemplating.TemplateValidationException: The template is not valid. /Users/runner/work/carbon-lang/carbon-lang/./.github/actions/test/action.yml (Line: 31, Col: 7): Required property is missing: shell,/Users/runner/work/carbon-lang/carbon-lang/./.github/actions/test/action.yml (Line: 40, Col: 7): Required property is missing: shell,/Users/runner/work/carbon-lang/carbon-lang/./.github/actions/test/action.yml (Line: 58, Col: 7): Required property is missing: shell,/Users/runner/work/carbon-lang/carbon-lang/./.github/actions/test/action.yml (Line: 62, Col: 7): Required property is missing: shell,/Users/runner/work/carbon-lang/carbon-lang/./.github/actions/test/action.yml (Line: 85, Col: 7): Required property is missing: shell,/Users/runner/work/carbon-lang/carbon-lang/./.github/actions/test/action.yml (Line: 96, Col: 7): Required property is missing: shell,/Users/runner/work/carbon-lang/carbon-lang/./.github/actions/test/action.yml (Line: 115, Col: 7): Required property is missing: shell,/Users/runner/work/carbon-lang/carbon-lang/./.github/actions/test/action.yml (Line: 137, Col: 7): Required property is missing: shell,/Users/runner/work/carbon-lang/carbon-lang/./.github/actions/test/action.yml (Line: 150, 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)