these 2 derivations will be built:
  /nix/store/f2jh9lqhqw6h2w91y1f2j326jzmnb6l3-nixos-test-driver-pgrouting.drv
  /nix/store/pazg65fyg9rha4ch7hn2p6wbnpvrqihh-vm-test-run-pgrouting.drv