- Introduces Buildkite Cache as generally available for hosted and self‑hosted agents, providing `buildkite-agent cache` commands to save and restore arbitrary files.
- Adds `cache exec` to skip whole commands when inputs match cached keys, with policy controls to restrict cache writes from untrusted builds.
- Requires agent v4.0.3+ (v4.2.1+ for exec) and supports custom cache configs, fallback keys, and detailed documentation.
Buildkite Cache is generally available
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