Setting up GitLab Runner For Continuous Integration

This post introduces GitLab Runner and its Docker executor for setting up CI workflows. It details how to create a `.gitlab-ci.yml` file for a Node.js project with a PostgreSQL dependency, including specifying base images, services, and scripts. It explains how to use shared runners and how to install and register a specific runner on a private server. Additionally, it covers optimizing build times by enabling caching for `node_modules` and parallelizing tests by splitting jobs and increasing runner concurrency.