Export built images as tarballs to ease distribution

Registered by Vladislav Belogrudov

We need a functionality to distribute images as tarballs, e.g. via http/ftp/cd not requiring any registry running like DockerHub. A user should be able to specify a folder instead of local registry and build process would run
    docker save "${full_name}" > "${EXPORT_DIR}/${short_name}.tar
and would xz it if necessary (takes lots of time to compress so is optional)

Blueprint information

Status:
Complete
Approver:
None
Priority:
Undefined
Drafter:
Vladislav Belogrudov
Direction:
Needs approval
Assignee:
Vladislav Belogrudov
Definition:
Obsolete
Series goal:
None
Implementation:
Unknown
Milestone target:
None
Completed by
Vladislav Belogrudov

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I disagree with this being in-scope for Kolla. I don't want to reinvent the wheel (the docker registry). Nothing we do currently _prevents_ using `docker save`. I disagree with Kolla needing to provide a way or even documentation on how to bypass the registry. -- SamYaple

You are right, it's overkill for the project. -vbel

(?)

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