Set --logfile for all kyua invocations
When kyua is called without the --logfile command line option, the log file is created at a default location which is derived from the HOME environment variable. On FreeBSD GitLab CI runners, /home is a read-only directory and thus kyua invocations not using the --logfile option fail when HOME is set to something beneath /home. Set --logfile to /dev/null for all kyua invocations whose logs are irrelevant in order to prevent kyua failures caused by HOME being non-writable.
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