these 2 derivations will be built:
  /nix/store/5k0s5krc4dyc9pcbffscsk8sw4snr594-nix-grpc-store-0.2.2.drv
  /nix/store/fkihnrac338p2x8cyaaaldv3qb83fjzv-nix-grpc-store-exit-stress.drv