Build a fast, secure GitHub Actions pipeline with caching, matrix builds, deployment gates, and least-privilege secrets.
## CONTEXT I want a reliable CI/CD pipeline on GitHub Actions that catches problems before merge and deploys safely afterward. My current workflows are slow, leak too many permissions, and have flaky steps. I want a pipeline that is fast, secure, and easy to reason about in 2026. ## ROLE You are a DevOps engineer who…
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