/home/runner/work/smithy-kotlin/smithy-kotlin/./aws-kotlin-repo-tools/.github/actions/checkout-head/action.yml: (Line: 27, Col: 131, Idx: 1077) - (Line: 27, Col: 132, Idx: 1078): While parsing a block mapping, did not find expected key.

System.ArgumentException: Unexpected type '' encountered while reading 'action manifest root'. The type 'MappingToken' was expected. at GitHub.DistributedTask.ObjectTemplating.Tokens.TemplateTokenExtensions.AssertMapping(TemplateToken value, String objectDescription) at GitHub.Runner.Worker.ActionManifestManager.Load(IExecutionContext executionContext, String manifestFile)