Fix OpenStack Swift Keystone token rate limiting (#38145)

config/initializers/fog_connection_cache.rb

@@ -0,0 +1,17 @@
+# frozen_string_literal: true
+
+if ENV['SWIFT_ENABLED'] == 'true'
+  module PaperclipFogConnectionCache
+    def connection
+      @connection ||= begin
+        key = fog_credentials.hash
+        Thread.current[:paperclip_fog_connections] ||= {}
+        Thread.current[:paperclip_fog_connections][key] ||= ::Fog::Storage.new(fog_credentials)
+      end
+    end
+  end
+
+  Rails.application.config.after_initialize do
+    Paperclip::Storage::Fog.prepend(PaperclipFogConnectionCache)
+  end
+end