.gitlab-ci.yml: collect the distcheck error logs

Currently we issue both check and distcheck, as reportedly there has
been cases in the past one works, while the other doesn't.

Yet we only collect the check artefacts (test logs).

Correct that, by picking the distcheck ones as well.
Note: the build-*/wayland*/ directory is purged by distcheck if it runs
successfully.

Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com>
Reviewed-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>