Shipwright

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- Nothing changed yet.

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- Add better fast-alias error message for missing manifest.
(`Issue 103 <https://github.com/6si/shipwright/pull/103>`_).
- Retry on error during docker push.
(`Issue 104 <https://github.com/6si/shipwright/pull/104>`_).
- Pull parent images before build to avoid problems with
docker-py build not sending credentials.
(`Issue 102 <https://github.com/6si/shipwright/pull/102>`_).
- Push and tag images as soon as they are built.
(`Issue 101 <https://github.com/6si/shipwright/pull/101>`_).
- Base the cache key on the globs in Docker COPY/ADD commands.
(`Issue 98 <https://github.com/6si/shipwright/pull/98>`_).

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- Add proper stack traces for direct registry errors.
(`Issue 93 <https://github.com/6si/shipwright/pull/93>`_).
- Handle differences between docker over TCP and Unix socket.
(`Issue 96 <https://github.com/6si/shipwright/pull/96>`_).
- Mark every internal package as private to allow exporting
of select parts of shipwright publicly.
(`Issue 99 <https://github.com/6si/shipwright/pull/99>`_).
- Create shipwright.targets.targets function to list available
docker targets in a repo programaticaly.
(`Issue 100 <https://github.com/6si/shipwright/pull/100>`_).

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- Depend on docker>=2.0.1.
(`Issue 91 <https://github.com/6si/shipwright/pull/91>`_).

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- Exprimental --registry-login cache flag to skip creation of already built
images and speed up tagging. Feature not subject to semver.
(`Issue 89 <https://github.com/6si/shipwright/pull/89>`_).

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- Fix changelog.