In Q3 2024, our 14-person engineering team was spending $18,200 per month on GitHub Actions build minutes—42% of our total cloud spend—for a pipeline that took 14 minutes average to build a monolithic Go + React app. By migrating to Tekton 0.60 on self-hosted GKE runners, we cut that cost to $10,920/month, reduced p95 build times to 5.2 minutes, and eliminated all GitHub Actions rate limiting errors. Here's how we did it, with benchmarks, code, and zero fluff.

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Key Insights

Tekton 0.60's task caching and conditional execution cut redundant build steps by 78% compared to GitHub Actions matrix workflows

Self-hosted Tekton on GKE with spot instances reduced per-build-minute cost from $0.008 (GitHub…