More space in a landing PPA or cleanup done

https://launchpad.net/~ci-train-ppa-service/+archive/ubuntu/landing-012 currently uses 22.5GB out of 20.0GB, so I can't upload any new packages there. This situation was caused from me copying Qt 5.5.1 over there on top of 5.5.0 from another silo because otherwise the PPA would not have been usable by developers until 5.5.1 was complete enough.

I expect 20.0GB to be enough, but currently Launchpad has not yet cleaned up enough of the old packages there. If the situation is different by the time you read this, then feel free to close this question. But if it's still like that, please either increase the space modestly (25GB should be enough until the auto-cleanup happens) or run some manual cleanup process to get under the limit.