Why Tech Platforms Don't Use GitHub Actions: The Case for GitHub Apps and Centralized Runners at Scale

Originally published at labitcode.com When a software team grows from 10 developers to 50, GitHub Actions feels like magic. You drop a .github/workflows/ci.yml file into your repository, define a few steps in YAML, and GitHub spins up an Azure-hosted virtual machine to build and test your code. There are no build servers to patch, no Jenkins masters to restart, and zero upfront infrastructure to maintain. Fast-forward to an enterprise organization with 3,000 developers, 1,200 microservices, and high-frequency deployment cadences. Suddenly, that same .github/workflows directory transforms into
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