add ck editor file upload endpoint

db/migrate/20220721132022_create_ck_editor_uploads.rb

@@ -0,0 +1,7 @@
+class CreateCkEditorUploads < ActiveRecord::Migration[7.0]
+  def change
+    create_table :ck_editor_uploads do |t|
+      t.timestamps
+    end
+  end
+end