[backport-0.21] dockerfile layer cache fixes and k3s tests - #13765
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…agger#13639) Co-authored-by: Claude Fable 5 <[email protected]> Signed-off-by: Marcos Nils <[email protected]>
Signed-off-by: Marcos Nils <[email protected]>
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dagger 0.21.8 Created-by: HarmonybrewBot Commit-by: HarmonybrewBot Merged-by: HarmonybrewBot Description: Created by `brew bump` --- Created with `brew bump-formula-pr`.<details> <summary>release notes</summary> <pre>## v0.21.8 - 2026-07-29 ### Changed - Changeset diffs are now computed from filesystem metadata instead of full-content comparison, significantly speeding up diff computation for large directories. by @marcosnils in dagger/dagger#13615 ### Fixed - Dockerfile build layer caching so unrelated build-context changes no longer bust the cache: `COPY`-ed directories now get a content-based cache identity, re-keying downstream steps only when copied content actually changes. by @marcosnils in dagger/dagger#13765 - The `--x-release` CLI re-exec so `_EXPERIMENTAL_DAGGER_RUNNER_HOST` is preserved (with a warning) instead of being stripped, and clarified its startup message to avoid implying it runs from any build. by @tiborvass in dagger/dagger#13752 - Silent SDK sessions no longer retain frontend telemetry in memory while Cloud and OTLP export remain enabled. `DAGGER_SILENT` is now honored as the equivalent of `--silent`. by @sipsma in dagger/dagger#13762 ### What to do next? - Read the [documentation](https://docs.dagger.io) - Join our [Discord server](https://discord.gg/dagger-io) - Follow us on [Twitter](https://twitter.com/dagger_io) </pre> <p>View the full release notes at <a href="https://github.com/dagger/dagger/releases/tag/v0.21.8">https://github.com/dagger/dagger/releases/tag/v0.21.8</a>.</p> </details> <hr> See merge request: Harmonybrew/homebrew-core!15378
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