[ci] Add a Void Linux bot

https://voidlinux.org/ is yet another and different distro written from scratch, thus completely eligible to have a bot here!

Seriously however not that useful yet however but I will try to overload it other tasks later, like our other bots.

No test yet also, couldn't install cairo-devel, will try to fix that later.

Their harfbuzz package source: https://github.com/void-linux/void-packages/blob/master/srcpkgs/harfbuzz/template
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