add ck editor file upload endpoint

Gemfile.lock

@@ -130,6 +130,9 @@ GEM
     hashie (5.0.0)
     i18n (1.12.0)
       concurrent-ruby (~> 1.0)
+    image_processing (1.12.2)
+      mini_magick (>= 4.9.5, < 5)
+      ruby-vips (>= 2.0.17, < 3)
     importmap-rails (1.1.5)
       actionpack (>= 6.0.0)
       railties (>= 6.0.0)
@@ -168,6 +171,7 @@ GEM
       mini_mime (>= 0.1.1)
     marcel (1.0.2)
     method_source (1.0.0)
+    mini_magick (4.11.0)
     mini_mime (1.1.2)
     minitest (5.16.2)
     msgpack (1.5.3)
@@ -279,6 +283,8 @@ GEM
     rspec-support (3.11.0)
     ruby-graphviz (1.2.5)
       rexml
+    ruby-vips (2.1.4)
+      ffi (~> 1.12)
     ruby2_keywords (0.0.5)
     sassc (2.4.0)
       ffi (~> 1.9)
@@ -334,6 +340,7 @@ DEPENDENCIES
   enumerize (~> 2.5)
   factory_bot_rails (~> 6.2)
   faker (~> 2.21)
+  image_processing (~> 1.2)
   importmap-rails
   jbuilder
   omniauth (~> 1.9.1)