Hey fellow RIOTers,
the gods of concurrency have revealed a flaw in our build system which kept lot's of leftover package sources within the CI build tree, causing some builds to fail with out-of-disk errors.
That has been fixed with [1], but all PR's showing the problem now need to be rebased on current master.
Kaspar [1] https://github.com/RIOT-OS/RIOT/pull/5610