cbsd: drop build logs in redis cache on restart #36
Description
On server restart, we should just drop all build logs from the redis cache that have XLEN > 0.
Otherwise, cached builds will not be dropped at all, given the tasks that were meant to drop the cache will not be rescheduled (and they were stopped/died when the server was stopped/killed).
We will still have the build logs on disk, so the users can always just obtain those.