/home/runner/work/slack-notify-action/slack-notify-action/./action.yml (Line: 73, Col: 3): Unexpected value 'steps'

System.ArgumentNullException: Value cannot be null. (Parameter 'You are using a composite action but there are no steps provided in /home/runner/work/slack-notify-action/slack-notify-action/./action.yml.') 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)