CI: Only run displayless tests

1 job from master in 6 minutes and 33 seconds (queued for 4 minutes and 29 seconds)
Status Job ID Name Coverage
  Test
failed #4228
test

00:06:33

 
Name Stage Failure
failed
test Test There is an unknown failure, please try again

(nautilus:915): Gtk-WARNING **: cannot open display:
-------

Full log written to /builds/GNOME/nautilus/_build/meson-logs/testlog.txt
FAILED: meson-test
/usr/bin/python3 -u /usr/bin/meson test --no-rebuild --print-errorlogs
ninja: build stopped: subcommand failed.
ERROR: Job failed: exit code 1