Managing multiple environments with Terraform and GitLab CI

This tutorial outlines a method for managing multiple infrastructure environments using GitLab CI and Terraform, focusing on a setup that includes dev, staging, and production environments. It explains the importance of utilizing separate environments for developing, testing, and deploying changes, ensuring rigorous testing before changes reach production. Each environment is organized with its own folder containing Terraform configuration and an environment-specific GitLab CI file, which only triggers jobs when changes occur in that specific folder. A helper file, `helper.yml`, is used to maintain consistency and reduce redundancy across environment-specific configurations by extending common jobs like formatting, validation, building, testing, deploying, and cleanup stages. The root-level GitLab CI file ties these configurations together, defining stages and container images. This setup allows changes to be safely promoted through environments via merge requests, ensuring that all modifications are reviewed and approved, and maintaining stability in the production environment.

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