these 2 derivations will be built:
  /nix/store/dxw0dcp22vna8gsigc6z4p3bb6ij7w2v-nixos-test-driver-pgrouting.drv
  /nix/store/bb5x7b1d5w2zi0nm1iknixpb0mifqfxm-vm-test-run-pgrouting.drv