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Add libvirt-executor image for our GitLab Runner custom executor

Kristian Klausen requested to merge libvirt-executor-image into master

We have provided a custom executor[1] for a few years[2] now. It uses the "basic" image which is modified on each runner to include the relevant packages and tweaks.

Modifying the image is cumbersome (convert qcow2 to raw, losesetup, arch-chroot, convert raw to qcow2 etc.) and requires administrative privileges on the runner. The arch-boxes project already has all the needed infrastructure for doing these kinds of "modifications", so let's just add a extra image with all the needed packages and tweaks and remove the complexity from the infrastructure repository.

The required changes to the custom executor can be found in this infrastructure MR[3]. This image is based on the newest version of the "modification script" from said MR[3], just before it is removed in favor of this image.

[1] https://docs.gitlab.com/runner/executors/custom.html
[2] infrastructure!385 (merged)
[3] infrastructure!881 (merged)

Edited by Kristian Klausen

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