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Design GitHub Actions matrix jobs with valid combinations, explicit failure handling, bounded parallelism, and predictable CI cost.
Pin each Actions run-step shell, understand its failure flags and lifetime, and keep event data out of generated shell source.
Make BuildKit CI caches faster without confusing reuse with freshness; design cache keys, mounts, remote backends, and secret handling deliberately.
Design GitHub Actions artifact handoffs with immutable names, matrix-safe downloads, retention controls, cache boundaries, and reliable missing-file failures.
Configure GitHub Actions for merge queues so required checks validate queued commits, report reliably, and keep merge throughput predictable.
Build reusable GitHub Actions workflows with typed inputs, explicit outputs, least-privilege tokens, pinned references, and testable caller contracts.
Design repeatable WSL integration CI with a Windows runner, Ubuntu's WSL actions, serialized VM lifecycle jobs, and Linux-side test evidence.