these 2 derivations will be built:
  /nix/store/sb70qd2az5xb88y4s9nl29l8fr3954z2-nixos-test-driver-pgrouting.drv
  /nix/store/281fq38phwdid3j4fl3ddcp0jx2ybpbs-vm-test-run-pgrouting.drv