Run 'GC.start' after every EmailsOnPushWorker job

CHANGELOG

@@ -2,6 +2,7 @@ v 7.5.0
   - API: Add support for Hipchat (Kevin Houdebert)
   - Add time zone configuration on gitlab.yml (Sullivan Senechal)
   - Fix LDAP authentication for Git HTTP access
+  - Run 'GC.start' after every EmailsOnPushWorker job
   - Fix LDAP config lookup for provider 'ldap'
   - Add Atlassian Bamboo CI service (Drew Blessing)
   - Mentioned @user will receive email even if he is not participating in issue or commit

app/workers/emails_on_push_worker.rb

@@ -21,5 +21,8 @@ class EmailsOnPushWorker
     recipients.split(" ").each do |recipient|
       Notify.repository_push_email(project_id, recipient, author_id, branch, compare).deliver
     end
+  ensure
+    compare = nil
+    GC.start
   end
 end