ci: Error: chroot feature is disabled in Firejail configuration file

[kmk3]

From https://github.com/netblue30/firejail/runs/6873613906?check_suite_focus=true:

TESTING: invalid filename (test/fs/invalid_filename.exp)
spawn /bin/bash
firejail --noprofile --blacklist="bla&&bla"
runner@fv-az133-14:~/work/firejail/firejail/test/fs$ 
<est/fs$ firejail --noprofile --blacklist="bla&&bla" �
Error: "bla&&bla" is an invalid filename: rejected character: "&"
runner@fv-az133-14:~/work/firejail/firejail/test/fs$ 
<l/test/fs$ firejail --noprofile --chroot="bla&&bla" �
Error: chroot feature is disabled in Firejail configuration file
runner@fv-az133-14:~/work/firejail/firejail/test/fs$ TESTING ERROR 3.3

Error: chroot feature is disabled in Firejail configuration file

Likely caused by commit 67dd029 ("disable chroot by default in
/etc/firejail/firejail.config", 2022-06-13).

Relates to #5190.

Cc: @netblue30 @reinerh

[kmk3]

Fixed by commit bc48ad0 ("fix CI", 2022-06-15).