Handle corrupt git clones

When cloning the git repo:
1. Try to clone
2. If there's already a build directory reset it
3. Check the clone is valid

If anything goes wrong during that process:
1. Delete the clone directory
2. Clone it again
3. Check the clone is valid

Raise any errors after that

lib/kamal/commands/builder.rb

@@ -2,7 +2,8 @@ require "active_support/core_ext/string/filters"
 
 class Kamal::Commands::Builder < Kamal::Commands::Base
   delegate :create, :remove, :push, :clean, :pull, :info, :validate_image, to: :target
-  delegate :clone_directory, :build_directory, to: :"config.builder"
+
+  include Clone
 
   def name
     target.class.to_s.remove("Kamal::Commands::Builder::").underscore.inquiry
@@ -54,23 +55,6 @@ class Kamal::Commands::Builder < Kamal::Commands::Base
     end
   end
 
-  def create_clone_directory
-    make_directory clone_directory
-  end
-
-  def clone
-    git :clone, Kamal::Git.root, path: clone_directory
-  end
-
-  def clone_reset_steps
-    [
-      git(:remote, "set-url", :origin, Kamal::Git.root, path: build_directory),
-      git(:fetch, :origin, path: build_directory),
-      git(:reset, "--hard", Kamal::Git.revision, path: build_directory),
-      git(:clean, "-fdx", path: build_directory)
-    ]
-  end
-
   private
     def ensure_local_docker_installed
       docker "--version"