these 2 derivations will be built:
  /nix/store/2l6j5z0cgpqa76jx2vig7rwf4kq338cs-nixos-test-driver-pgrouting.drv
  /nix/store/mjpshjzxg1mhkafq9vwa93qd1bhpx2r9-vm-test-run-pgrouting.drv