these 2 derivations will be built:
  /nix/store/bmqvq5j8ibraf7d94fqjgww2hbkqw0jx-nixos-test-driver-pgrouting.drv
  /nix/store/q6p56fhglsp9vpl21yhpdk1559l91hfb-vm-test-run-pgrouting.drv