Try asking if your supplier is willing to increase the http timeout. Set this parameter in the /etc/gitlab/gitlab.rb file:
# i think it is in seconds unicorn['worker_timeout']='600' -- You received this message because you are subscribed to the Google Groups "GitLab" group. To unsubscribe from this group and stop receiving emails from it, send an email to gitlabhq+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/gitlabhq/a5073a3b-c082-45d2-a45a-31d6d00e3dc7%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.