code: func addStage1ImageFlags(flags *pflag.FlagSet) {
  	for _, data := range stage1FlagsData {
  		wrapper := &stage1ImageLocationFlag{
  			loc:  &overriddenStage1Location,
  			kind: data.kind,
  		}
  		flags.Var(wrapper, data.flag, data.help)
  	}
  }
docs: // addStage1ImageFlags adds flags for specifying custom stage1 image