Concurrent local and remote docker login

Login to the local and remote docker registries concurrently to shave
a couple of seconds off a deployment.

lib/kamal/cli/registry.rb

@@ -1,8 +1,7 @@
 class Kamal::Cli::Registry < Kamal::Cli::Base
   desc "login", "Log in to registry locally and remotely"
   def login
-    run_locally    { execute *KAMAL.registry.login }
-    on(KAMAL.hosts) { execute *KAMAL.registry.login }
+    on([ :local ] + KAMAL.hosts) { execute *KAMAL.registry.login }
   # FIXME: This rescue needed?
   rescue ArgumentError => e
     puts e.message

lib/kamal/commands/builder/multiarch.rb

@@ -10,7 +10,7 @@ class Kamal::Commands::Builder::Multiarch < Kamal::Commands::Builder::Base
   def push
     docker :buildx, :build,
       "--push",
-      "--platform", "linux/amd64,linux/arm64",
+      "--platform", platform_names,
       "--builder", builder_name,
       *build_options,
       build_context
@@ -26,4 +26,12 @@ class Kamal::Commands::Builder::Multiarch < Kamal::Commands::Builder::Base
     def builder_name
       "kamal-#{config.service}-multiarch"
     end
+
+    def platform_names
+      if local_arch
+        "linux/#{local_arch}"
+      else
+        "linux/amd64,linux/arm64"
+      end
+    end
 end

test/commands/builder_test.rb

@@ -37,6 +37,14 @@ class CommandsBuilderTest < ActiveSupport::TestCase
       builder.push.join(" ")
   end
 
+  test "target multiarch local when arch is set" do
+    builder = new_builder_command(builder: { "local" => { "arch" => "amd64" } })
+    assert_equal "multiarch", builder.name
+    assert_equal \
+      "docker buildx build --push --platform linux/amd64 --builder kamal-app-multiarch -t dhh/app:123 -t dhh/app:latest --label service=\"app\" --file Dockerfile .",
+      builder.push.join(" ")
+  end
+
   test "target native remote when only remote is set" do
     builder = new_builder_command(builder: { "remote" => { "arch" => "amd64" }, "cache" => { "type" => "gha" } })
     assert_equal "native/remote", builder.name