GitLab comes with built-in Continuous Integration, Continuous Deployment, and Continuous Delivery support to build, test, and deploy your application.
GitLab Runner is used to run your project's CI jobs and send the results back to GitLab.
GitLab Runner implements a number of executors that can be used to run your builds in different scenarios, a better way is to use Docker as it allows to have a clean build environment, with easy dependency management (all dependencies for building the project could be put in the Docker image). The Docker executor allows you to easily create a build environment with dependent services, like MySQL. In .gitlab-ci.yml file, with image keyword we can sepcify the docker image, which will be used to create a container on which your builds will run.
Official images publieshed on Docker Hub just contain basic modules, so usually we want to extend it with customized modules for convenient usage. In this repository I contribute a docker image contained everything to build and deploy laravel project, the image contains php7.1.21 and required extensions for build laravel5.5, node version 10, ansible for deploying project to remote server.
I hope developers can contribute docker images used for other project's CI/CD (projects powered by Java,Python,Ruby etc.).