Update Dockerfile

1 job for master in 57 seconds (queued for 2 seconds)
Name Stage Failure
build Build
 * base: mirror.hh.se
* extras: mirror.hh.se
* updates: mirror.hh.se
No package ruby-2.5 available.
Error: Nothing to do
The command '/bin/sh -c yum -y update && yum -y install ruby-2.5 && curl -sL https://rpm.nodesource.com/setup_10.x | bash - && yum -y install nodejs epel-release openssl rpm-build rsync which git && yum -y install ruby-devel gcc gcc-c++ make rubygems rake openssh-clients wget && yum -y install ansible && gem install -N fpm-cookery && yum -y update && yum clean all' returned a non-zero code: 1
Running after_script
Uploading artifacts for failed job
ERROR: Job failed: exit code 1