these 2 derivations will be built:
  /nix/store/px4pmhm0lrd0z8ysaysb4slay5d35iqm-nixos-test-driver-pgrouting.drv
  /nix/store/csgjlp7cpvrd4c4l5akxg36kzj7x8w6j-vm-test-run-pgrouting.drv