Rename to Kamal

lib/kamal/commands/registry.rb

@@ -0,0 +1,20 @@
+class Kamal::Commands::Registry < Kamal::Commands::Base
+  delegate :registry, to: :config
+
+  def login
+    docker :login, registry["server"], "-u", sensitive(lookup("username")), "-p", sensitive(lookup("password"))
+  end
+
+  def logout
+    docker :logout, registry["server"]
+  end
+
+  private
+    def lookup(key)
+      if registry[key].is_a?(Array)
+        ENV.fetch(registry[key].first).dup
+      else
+        registry[key]
+      end
+    end
+end