[Emacs] Use rubocop in ruby-mode

dotfiles/emacs.d/README.org

@@ -2322,6 +2322,13 @@ I don't use auto-complete at all, so I have set up a hook to automatically disab
 	(unbind-key "C-j" python-mode-map)
 	(add-hook 'python-mode-hook #'imalison:python-mode)))
 #+END_SRC
+*** ruby
+#+begin_src emacs-lisp
+(use-package ruby-mode
+  :config
+  (setf (alist-get 'ruby-ts-mode apheleia-mode-alist)
+        '(rubocop)))
+#+end_src
 *** go
 #+BEGIN_SRC emacs-lisp
 (use-package go-mode