Add internal_socket_dir to gitaly config in setup helper

changelogs/unreleased/jc-add-internal-socket-dir-to-setup.yml

+---
+title: Add internal_socket_dir to gitaly config in setup helper
+merge_request: 19170
+author:
+type: other

lib/gitlab/setup_helper.rb

@@ -40,6 +40,11 @@ module Gitlab
 
         config = { socket_path: address.sub(/\Aunix:/, ''), storage: storages }
         config[:auth] = { token: 'secret' } if Rails.env.test?
+
+        internal_socket_dir = File.join(gitaly_dir, 'internal_sockets')
+        FileUtils.mkdir(internal_socket_dir) unless File.exist?(internal_socket_dir)
+        config[:internal_socket_dir] = internal_socket_dir
+
         config[:'gitaly-ruby'] = { dir: File.join(gitaly_dir, 'ruby') } if gitaly_ruby
         config[:'gitlab-shell'] = { dir: Gitlab.config.gitlab_shell.path }
         config[:bin_dir] = Gitlab.config.gitaly.client_path