it's _very_ lightweight so it'll not waste your store space, to test it
just do

--8<---------------cut here---------------start------------->8---
$ rm container-minimal
$ guix system container container-minimal.scm -r container-minimal
$ sudo ./container-minimal
--8<---------------cut here---------------end--------------->8---

in all my tests mingetty gets started and respawned, I can enter the
container and manually stop term-tty[1..6] services

Thanks!
Giovanni

[1] may it depend on my user environment? I'm on a foreign distro
(Debian 9.7)

-- 
Giovanni Biscuolo

Xelera IT Infrastructures