kengo-k/docker-build/main/action.yaml: (Line: 22, Col: 39, Idx: 503) - (Line: 22, Col: 39, Idx: 503): Mapping values are not allowed in this context.

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)