these 2 derivations will be built:
  /nix/store/d3dzddl0wh9rscy5qksz82mim8ry8wl6-nixos-test-driver-pgrouting.drv
  /nix/store/z40csk3n77skxh6kanp4gsxw4icsh88z-vm-test-run-pgrouting.drv