Added Init to datastructure, fixups to container interface, and --setdefault to kernel and container build

internal/app/wwctl/container/build/root.go

@@ -12,11 +12,13 @@ var (
 	}
 	BuildForce bool
 	BuildAll   bool
+	SetDefault bool
 )
 
 func init() {
 	baseCmd.PersistentFlags().BoolVarP(&BuildAll, "all", "a", false, "(re)Build all VNFS images for all nodes")
 	baseCmd.PersistentFlags().BoolVarP(&BuildForce, "force", "f", false, "Force rebuild, even if it isn't necessary")
+	baseCmd.PersistentFlags().BoolVar(&SetDefault, "setdefault", false, "Set this container for the default profile")
 }
 
 // GetRootCommand returns the root cobra.Command for the application.