Add a pack option to the builder options

test/commands/builder_test.rb

@@ -53,6 +53,14 @@ class CommandsBuilderTest < ActiveSupport::TestCase
       builder.push.join(" ")
   end
 
+  test "target pack when pack is set" do
+    builder = new_builder_command(builder: { "pack" => { "arch" => "amd64" , "builder" => "heroku/builder:24", "buildpacks" => [ "heroku/ruby", "heroku/procfile" ] }})
+    assert_equal "native/pack", builder.name
+    assert_equal \
+      "pack build dhh/app:123 --platform linux/amd64 --builder heroku/builder:24 --buildpack heroku/ruby --buildpack heroku/procfile --buildpack paketo-buildpacks/image-labels -t dhh/app:123 -t dhh/app:latest --env BP_IMAGE_LABELS=service=app --path . && docker push dhh/app:123 && docker push dhh/app:latest",
+      builder.push.join(" ")
+  end
+
   test "build args" do
     builder = new_builder_command(builder: { "args" => { "a" => 1, "b" => 2 } })
     assert_equal \

test/configuration/builder_test.rb

@@ -32,6 +32,24 @@ class ConfigurationBuilderTest < ActiveSupport::TestCase
     assert_equal false, config.builder.remote?
   end
 
+  test "pack?" do
+    refute config.builder.pack?
+  end
+
+  test "pack? with pack builder" do
+    @deploy[:builder] = { "pack" => {"builder" => "heroku/builder:24"} }
+
+    assert config.builder.pack?
+  end
+
+  test "pack details" do
+    @deploy[:builder] = { "pack" => {"arch" => "amd64", "builder" => "heroku/builder:24", "buildpacks" => ["heroku/ruby", "heroku/procfile"]} }
+
+    assert_equal "amd64", config.builder.pack_arch
+    assert_equal "heroku/builder:24", config.builder.pack_builder
+    assert_equal ["heroku/ruby", "heroku/procfile"], config.builder.pack_buildpacks
+  end
+
   test "remote_arch" do
     assert_nil config.builder.remote_arch
   end