✨ add alpha update command

This commit adds the alpha update command. Alpha update attempts to update the version of the project and keep custom code by performing a tree-way merge with a synthetic ancestor.

Author: vitorfloriano

pkg/cli/alpha.go

@@ -31,6 +31,7 @@ const (
 var alphaCommands = []*cobra.Command{
 	newAlphaCommand(),
 	alpha.NewScaffoldCommand(),
+	alpha.NewUpdateCommand(),
 }
 
 func newAlphaCommand() *cobra.Command {