these 2 derivations will be built:
  /nix/store/y67z25bahiljnhxpkjifqmzz70vbjbyj-nixos-test-driver-pgrouting.drv
  /nix/store/1l4xyi5g97vi0l8jblsf8x69pnzmzyz0-vm-test-run-pgrouting.drv