Shipwright

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- Add images command for creating docker save.
(`Issue 88 <https://github.com/6si/shipwright/pull/88>`_).

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- Push images to the registry in parallel.
(`Issue 82 <https://github.com/6si/shipwright/pull/82>`_).

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- Also push image target ref so that --pull-cache can pull them.
(`Issue 81 <https://github.com/6si/shipwright/pull/81>`_).

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- Warn on --pull-cache errors
(`Issue 80 <https://github.com/6si/shipwright/pull/80>`_).

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- Add --pull-cache to pull images from repository before building.
(`Issue 49 <https://github.com/6si/shipwright/issues/49>`_).

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- Add --dirty to build from working tree, even when uncommitted and untracked changes exist.
(`Issue 74 <https://github.com/6si/shipwright/pull/74>`_).
Thanks `James Pickering <https://github.com/jamespic>`_!
- Ignore images without RepoTags when gathering built_tags to fix a crash
caused by docker images pulled via RepoDigest.
(`Issue 77 <https://github.com/6si/shipwright/issues/77>`_).
Thanks `kgpayne <https://github.com/kgpayne>`_!