How to Configure & Register GitLab runner on CentOS

GitLab Runner is an application that runs jobs in pipelines in conjunction with GitLab CI/CD. It is open-source and written in Go. It comprises a single binary that does not require any language-specific requirements. Also, GitLab Runner can be deployed as a Docker container or Kubernetes cluster.
For more explanation on this video: https://www.linuxhelp.com/how-to-install-and-configure-gitlab-runner-on-centos-7