centos: enable epel

.gitlab-ci.yml

@@ -214,7 +214,8 @@ deploy:centos:7:oxinstaller:
         ssh -tt -o ConnectTimeout=30 -o StrictHostKeyChecking=no -i openstack/tmp/id_rsa centos@$instance_centos_7_floatingip <<EOF
         sudo su
         whoami
-        yum update -y --disablerepo=epel && yum -y install git --disablerepo=epel
+        yum -y --enablerepo=extras install epel-release
+        yum -y install git
         git clone -b develop https://gitlab.open-xchange.com/qa/ox-installer.git /root/ox-installer/
         /root/ox-installer/ox-installer.sh --singlenode --dovecot
         EOF