We are running into too many out of disk space situations with OWS on
the main disk.
This way, we can reuse the Gerrit disk for all that data, which
hopefully, is quite shared with Gerrit.
Signed-off-by: Raito Bezarius <masterancpp@gmail.com>
The local refspec was weird and exploiting a edge case for the nixpkgs
jobs where local and from were the same.
We are more explicit now, which fixes the sandbox jobs.
Signed-off-by: Raito Bezarius <masterancpp@gmail.com>