/etc/bash.bashrc appears to be Debian-specific[0] (or specific to bash
versions compiled with -DSYS_BASHRC), which doesn't seem to be the case
for C8S. Let's use ~/.bashrc instead to make the CIs happy again.
[0] https://sources.debian.org/src/bash/5.1-6/debian/README/#L50-L56
Wraps nspawn to be able to use pexpect. The test logs in on the console
and runs screen. In one screen window it types in shutdown commands and
checks whether a wall message was sent to the other.
Frantisek Sumsal
Ludwig Nussel