Refactor admin slice routing and auth

slices/admin/config/authenticated_admin_action.rb

@@ -0,0 +1,17 @@
+module Adamantium
+  class AuthenticatedAdminAction
+    def self.call(action:)
+
+      action_proc = ->(env) { Admin::Container["actions.#{action}"].(env) }
+
+      if Hanami.app.settings.basic_auth_username && Hanami.app.settings.basic_auth_password
+        Rack::Auth::Basic.new(action_proc) do |username, password|
+          username == Hanami.app.settings.basic_auth_username &&
+            password == Hanami.app.settings.basic_auth_password
+        end
+      else
+        Rack::Auth::Basic.new(action_proc) { |_username, _password| true }
+      end
+    end
+  end
+end