these 2 derivations will be built:
  /nix/store/0nxw5gnv93j08gf0k0hgmijpy68g1ppl-nixos-test-driver-pgrouting.drv
  /nix/store/qrg9ia9lncggvbf38xgrdn9gvq1lzrds-vm-test-run-pgrouting.drv