Merge branch 'post_receive_n_plus_1_workaround' into 'master'

Workaround for #38259

See merge request gitlab-org/gitlab-ce!14453

lib/gitlab/data_builder/push.rb

@@ -64,9 +64,12 @@ module Gitlab
 
         # For performance purposes maximum 20 latest commits
         # will be passed as post receive hook data.
-        commit_attrs = commits_limited.map do |commit|
+        # n+1: https://gitlab.com/gitlab-org/gitlab-ce/issues/38259
+        commit_attrs = Gitlab::GitalyClient.allow_n_plus_1_calls do
+          commits_limited.map do |commit|
             commit.hook_attrs(with_changed_files: true)
           end
+        end
 
         type = Gitlab::Git.tag_ref?(ref) ? 'tag_push' : 'push'