A ref update rules for a viewer.
allowsDeletions : Boolean!
allowsForcePushes : Boolean!
pattern : String!
requiredApprovingReviewCount : Int
requiredStatusCheckContexts : [String]
requiresCodeOwnerReviews : Boolean!
requiresConversationResolution : Boolean!
requiresLinearHistory : Boolean!
requiresSignatures : Boolean!
viewerAllowedToDismissReviews : Boolean!
viewerCanPush : Boolean!