Merge branch 'avatar_n_plus_one' into 'master'

Allow n+1s caused by avatar fetches on the project dashboard. See…

See merge request gitlab-org/gitlab-ce!14475

app/models/repository.rb

@@ -534,8 +534,11 @@ class Repository
   cache_method :tag_count, fallback: 0
 
   def avatar
-    if tree = file_on_head(:avatar)
-      tree.path
+    # n+1: https://gitlab.com/gitlab-org/gitlab-ce/issues/38327
+    Gitlab::GitalyClient.allow_n_plus_1_calls do
+      if tree = file_on_head(:avatar)
+        tree.path
+      end
     end
   end
   cache_method :avatar