Merge branch 'pb-add-unix-to-allowed-hosts' into 'master'

Add unix to allowed hosts

See merge request gitlab-org/gitlab!24541

config/initializers/rails_host_authorization.rb

@@ -3,5 +3,5 @@
 # This file requires config/initializers/1_settings.rb
 
 if Rails.env.development?
-  Rails.application.config.hosts << Gitlab.config.gitlab.host
+  Rails.application.config.hosts += [Gitlab.config.gitlab.host, 'unix']
 end