How to use GitLab CI to deploy to multiple environments

This post outlines a success story of managing a simple news portal using GitLab CI/CD for deploying HTML files to Amazon S3, demonstrating how to implement continuous integration and deployment processes in a technology-agnostic manner. It begins with automating the deployment of static HTML files using GitLab CI, emphasizing the importance of setting environment variables securely and using Docker images for dependencies like awscli. As the fictional scenario evolves with a growing team, it discusses best practices for handling multiple developers, such as creating separate branches for development and using GitLab Pages for staging environments to preview changes before merging. The narrative progresses to handling larger teams by introducing Review Apps for per-branch deployment, integrating Slack for deployment notifications, and transitioning to manual production deployments to handle emergencies. Finally, it suggests using the dpl gem for deploying to various platforms, showcasing how GitLab CI/CD can maintain a uniform deployment process across different systems while ensuring secure and efficient management of secret keys and deployment histories.

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