Rip out qubesbuilder.CopyTemplateBack

[DemiMarie]

How to file a helpful issue

The problem you're addressing (if any)

qubesbuilder.CopyTemplateBack is unnecessary attack surface.

The solution you'd like

Replace it by redirecting the build’s stdout to stderr and returning the built image via stdout.

The value to a user, and who that user might be

Developers will benefit because building the template in a disposable qube will be easier to set up.

[marmarek]

That's part of builderv1 which doesn't get feature development anymore.

[github-actions]

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