Scaling Golang CI by Replacing actions/setup-go

CloudX engineers reduced their Golang CI test job runtimes by 69% by replacing GitHub's official actions/setup-go with a custom alternative (cloudx-io/setup-go) that better leverages the Go build cache. GitHub's default action causes parallel jobs to interfere with each other and loads stale cache values, making 86% of its work unnecessary in typical monorepos with multiple parallel test jobs. The company is open-sourcing their solution so other organizations managing complex Go projects can achieve similar performance improvements.