Prompted by installation trouble reported at
https://groups.google.com/d/msg/sage-devel/kiEh8JgbWeQ/Oqe77sQTCAAJ

we add infrastructure to test on voidlinux installations via Docker
by repeating the steps done for Slackware in #29354

To test:

tox -e docker-voidlinux-standard

References:

• https://hub.docker.com/r/voidlinux/voidlinux
• https://github.com/void-linux/xbps

Depends on #30064

CC: @dimpase @orlitzky @kliem @slel

Component: porting

Author: Nicolò Piazzalunga, Matthias Koeppe

Branch/Commit: d43730c

Reviewer: Jonathan Kliem

Issue created by migration from https://trac.sagemath.org/ticket/30044