Chore: Switch from Carrierwave to ActiveStorage (#393)

app/models/concerns/avatarable.rb

@@ -0,0 +1,18 @@
+# frozen_string_literal: true
+
+module Avatarable
+  extend ActiveSupport::Concern
+  include Rails.application.routes.url_helpers
+
+  included do
+    has_one_attached :avatar
+  end
+
+  def avatar_url
+    if avatar.attached? && avatar.representable?
+      url_for(avatar.representation(resize: '250x250'))
+    else
+      ''
+    end
+  end
+end