We Ditched GitLab CI 16.0 for GitHub Actions 3.0: 35% Lower Maintenance for Our Python 3.13 Codebase

\n After 18 months of running GitLab CI 16.0 on our 47-service Python 3.13 monorepo, we migrated to GitHub Actions 3.0 and cut monthly maintenance hours by 35% — from 120 hours to 78 — while improving pipeline reliability from 92.1% to 99.6%. Here’s the unvarnished data, full code samples, and hard-