The .gitlab-ci.yml file in this directory provides a GitLab CI/CD configuration file that can be used to run linting and unit testing for the Mattermost application.
To configure your GitLab instance to use this configuration file (and without having to move it to the base directory in this git repository), you can configure the CI_CONFIG_PATH predefined variable for the repository in GitLab with the configuration file path (build/contrib/gitlab/.gitlab-ci.yml).