Merge branch 'ashmckenzie/gitaly-listen-on-localhost-for-prometheus' into 'master'

Listen on localhost for Gitaly's Prometheus

See merge request gitlab-org/gitlab!57438

spec/support/helpers/test_env.rb

@@ -175,7 +175,7 @@ module TestEnv
           { 'default' => repos_path },
           force: true,
           options: {
-            prometheus_listen_addr: ':9236'
+            prometheus_listen_addr: 'localhost:9236'
           }
         )
         Gitlab::SetupHelper::Gitaly.create_configuration(