Stop the 'merge and pray' workflow! This guide was originally published on devopsstart.com and explores how to implement an automated architecture firewall for your Terraform PRs using OPA. Introduction An architecture firewall is a governance layer integrated into your CI/CD pipeline that automatically blocks infrastructure changes violating security or organizational standards before they reach your environment. Unlike a network firewall that filters packets, this firewall filters Pull Requests (PRs). It transforms your infrastructure requirements from passive documentation in a wiki into active, executable code that cannot be ignored. In this article, you will learn how to move beyond the "merge and pray" workflow by implementing Policy as Code (PaC). We will explore the technical bridge between a terraform plan and automated validation using tools like Open Policy Agent (OPA) and Checkov.…