GitHub.DistributedTask.ObjectTemplating.TemplateValidationException: The template is not valid. /home/runner/work/tinyburg/tinyburg/./.github/composable-workflows/rush-build/action.yaml (Line: 30, Col: 7): Required property is missing: shell,/home/runner/work/tinyburg/tinyburg/./.github/composable-workflows/rush-build/action.yaml (Line: 35, Col: 7): Required property is missing: shell,/home/runner/work/tinyburg/tinyburg/./.github/composable-workflows/rush-build/action.yaml (Line: 47, Col: 7): Required property is missing: shell,/home/runner/work/tinyburg/tinyburg/./.github/composable-workflows/rush-build/action.yaml (Line: 53, Col: 7): Required property is missing: shell,/home/runner/work/tinyburg/tinyburg/./.github/composable-workflows/rush-build/action.yaml (Line: 56, Col: 7): Required property is missing: shell,/home/runner/work/tinyburg/tinyburg/./.github/composable-workflows/rush-build/action.yaml (Line: 65, Col: 7): Required property is missing: shell,/home/runner/work/tinyburg/tinyburg/./.github/composable-workflows/rush-build/action.yaml (Line: 72, Col: 7): Required property is missing: shell,/home/runner/work/tinyburg/tinyburg/./.github/composable-workflows/rush-build/action.yaml (Line: 75, 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)