trigger docker hub build only on master
trigger docker hub build only on master

commit d4a7239cd997fb672c96151fcc91d99ca864779a
Author: oott123 <git@public.oott123.com>
Date:   Wed Aug 30 21:06:50 2017 +0800

    try to fix

commit 81464cf8c8cbc1f15a3a0eebda56c6426e35bb36
Author: oott123 <git@public.oott123.com>
Date:   Wed Aug 30 21:03:41 2017 +0800

    ci workflow

omega-bbs/mua,omega-bbs/mua