Proposal to move this repo into https://github.com/xfce-test

[smac89]

I was initially going to create a PR for adding support for building xfce-test archlinux image, but along the way I discovered that the current workflow used in creating the current ubuntu containers will not really fit well in arch. Part of my motivation is that I wanted to make sure pacman is able to track the installed packages and their dependencies.

I took some of the ideas used in xfce-test and created https://github.com/xfce-test/container-archlinux

Right now https://github.com/xfce-test just contains the archlinux container, but I want to propose that we also move the current xfce-test into that org and call it something like container-ubuntu seeing as it builds different versions of ubuntu

What do you think?