Fix MySQL

app/models/ci/pipeline.rb

@@ -198,7 +198,12 @@ module Ci
     def self.newest_first(ref: nil, limit: 100)
       relation = order(id: :desc)
       relation = relation.where(ref: ref) if ref
-      relation = relation.where(id: relation.limit(limit).select(:id)) if limit
+      if limit
+        ids = relation.limit(limit).select(:id)
+        # MySQL does not support limit in subquery
+        ids = ids.pluck(:id) if Gitlab::Database.mysql?
+        relation = relation.where(id: ids)
+      end
       relation
     end