Draft: fix: install xz to allow using lzma

Attempt to resolve #41 by installing xz.

XZ Utils (previously LZMA Utils) is a set of free software command-line lossless data compressors, including the programs lzma and xz, for Unix-like operating systems and, from version 5.0 onwards, Microsoft Windows.

(https://en.wikipedia.org/wiki/XZ_Utils)

This would also need a backport into the v0.2 series.

When using python2, the lzma import succeeds. In addition, an xz exists at /usr/bin/xz even prior to this explicit install added here.

This is currently untested, I opened this to build the image in CI to see if this addresses the problem.

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mentioned in issue #41

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• a5258f90 - fix CI for image destination

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mentioned in issue #42

marked this merge request as draft

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• c5a5b3de - build base image on fork

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• 5a3fbb34 - build base image first

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Converting this temporarily into a testing ground for building the base image. Currently with how the CI is set up that does not work on forks I think. In addition, images built on forks currently go nowhere as DESTINATION_FLAG is not set (#42).

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• 753e8258 - remove duplicate destination flag

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• 099b8f14 - use temporarily built base image from fork

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