these 2 derivations will be built:
  /nix/store/n8jza2zj3icf4g8pw7hbnsqa249xha9x-nixos-test-driver-pgrouting.drv
  /nix/store/rp8sdxdr4gbgsxfsfpz4ykddwracx492-vm-test-run-pgrouting.drv