官方文档：
https://docs.gitlab.com/runner/install/linux-repository.html
通过文档查看，centos7的情况下，先添加rpm源：
curl -s https://packages.gitlab.com/install/repositories/runner/gitlab-runner/script.rpm.sh | sudo bash
curl -L https://packages.gitlab.com/install/repositories/runner/gitlab-runner/script.rpm.sh | sudo bash
查看可以支持的版本：
yum list gitlab-runner –showduplicates | sort -r
在配置yum源的时候建议将runner_gitlab-runner.repo参数gpgcheck值设置为0
安装想要的版本：
yum install gitlab-runner-10.8.2-1
chmod +x /usr/local/bin/gitlab-runner
useradd –comment ‘GitLab Runner’ –create-home gitlab-runner –shell /bin/bash
gitlab-runner install –user=gitlab-runner –working-directory=/home/gitlab-runner