The /tmp directory was using the SSD disk which is not erased across
boots. Nix will use /tmp to perform the builds, so we want it to be as
fast as possible. In general, all the machines have enough space to
handle large builds like LLVM.
Reviewed-by: Aleix Roca Nonell <aleix.rocanonell@bsc.es>
Rodrigo Arias Mallo
82f5d828c2