Local build doesn't need a builder

lib/kamal/commands/builder/local.rb

@@ -1,10 +1,8 @@
 class Kamal::Commands::Builder::Local < Kamal::Commands::Builder::Base
   def create
-    docker :buildx, :create, "--name", builder_name, "--driver=docker-container"
   end
 
   def remove
-    docker :buildx, :rm, builder_name
   end
 
   def info
@@ -22,10 +20,6 @@ class Kamal::Commands::Builder::Local < Kamal::Commands::Builder::Base
       build_context
   end
 
-  def context_hosts
-    docker :buildx, :inspect, builder_name, "> /dev/null"
-  end
-
   private
     def builder_name
       "kamal-local"