Heptapod CI: fixed log extraction for failed builds
Had forgotten that the logs are located in subdirectories. It would be tempting do just take the whole /var/log/gitlab directory, but then I'd be wary it could be too big. I expect the artifacts system to perform compression (IIRC it's artifacts are wrapped in a zip file). We do have some random failures in the nightly builds that I'd like to investigate. We'll see if that is enough.