Building a GitLab CI/CD pipeline for a monorepo the easy way

Monorepos, which allow multiple application codes to reside in a single repository, have become more efficient with GitLab 16.4's new feature that includes pipelines based on directory changes. Previously, managing monorepos in GitLab was challenging due to the need for complex workarounds to run specific CI/CD pipelines based on which application's code was altered. Traditionally, project-level pipeline configurations included all application-specific YAML files, using hidden jobs to trigger builds and tests only when changes occurred in specific directories, which often led to redundant code and potential errors. The introduction of the "include with rules:changes" feature now enables more straightforward, flexible, and maintainable pipeline setups by allowing conditional inclusion of YAML files based on changes in designated directories. This advancement significantly reduces the need for repetitive code and enhances job definition flexibility, although developers must still consider that all jobs will run upon the initial push to a new branch or tag, unless mitigated by specific branch management strategies. The update represents a significant improvement in handling monorepos within GitLab's CI/CD framework, offering a streamlined approach for managing complex multi-application projects.

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