cancel-in-progress:true Silently Dropped Our Deploys — GitHub Actions Concurrency Gotcha

cancel-in-progress:true Silently Dropped Our Deploys The Symptom With multiple Claude Code instances pushing in parallel (VSCode, PowerShell, Windows), we noticed commits occasionally not showing up in production: Commit A → push → deploy-prod starts Commit B → push → deploy-prod starts → A's run gets CANCELLED Commit B's deploy succeeds. Commit A's changes never reach production. Root Cause: Misusing cancel-in-progress: true # ❌ Dangerous for deploy workflows concurrency : group : deploy-prod c