these 2 derivations will be built:
  /nix/store/kx5qw9yxvq0qmiy098gx7j8m6mm0yg7l-nixos-test-driver-plpgsql_check.drv
  /nix/store/qjnsq8nsayqfafgq9gj9v24cggwqz7nw-vm-test-run-plpgsql_check.drv