Void is a general purpose operating system, based on the monolithic Linux® kernel. Its package system allows you to quickly install, update and remove software; software is provided in binary packages or can be built directly from sources with the help of the XBPS source packages collection.
It is available for the Intel x86®, ARM® and MIPS® processor architectures; Software packages can be built natively or cross compiling through the XBPS source packages collection.
https://voidlinux.org/
See https://github.com/lxc/lxc-templates/blob/master/templates/lxc-voidlinux.in Small hint: That template seems to incorrectly link to
voidlinux.eu
instead ofvoidlinux.org
(domain shift).