these 2 derivations will be built:
  /nix/store/5nrfmliqkxk6zaxcjzdgsiynljrwg8g5-nixos-test-driver-plpgsql_check.drv
  /nix/store/mr7bff9pixwrsyfvyd2j5vi2l4ysqyii-vm-test-run-plpgsql_check.drv