Using child pipelines to continuously deploy to five environments

This post introduces a strategy for continuous deployment to multiple environments (review, integration, QA, staging, production) using GitLab CI/CD child pipelines and Terraform. It details the setup of Terraform code for deploying AWS resources (VPC, subnets, EC2 instance) and configuring a Terraform HTTP backend to store state in GitLab. The workflow includes automated deployment to temporary review environments that are destroyed upon branch closure, automated deployment to an integration environment, manual triggers for QA and production, and tag-based deployment to staging.