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debootstrap: use --force-check-gpg

Lyndon Brown requested to merge jnqnfe/live-build:debootstrap_forcegpgcheck into master

I asked for such a switch to be added in debootstrap back at the start of 2015 in #775454 as part of a review I undertook of its security. A slightly modified patch was merged a few months later and made it into version 1.0.69.

A patch was never merged into live-build to make use of it however. Let's do that now.

The benefit of this, as explained in #775454, is that if we want strong security (LB_APT_SECURE=true) then should debootstrap not be able to find the GPG key to verify things with, it will abort with an error instead of falling back to just https downloads with a warning. Such a warning would be easy to miss in the log output, and security could potentially be compromised if this were to happen.

Edited by Lyndon Brown

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