these 2 derivations will be built:
  /nix/store/8j2k1k03ji2n281gvynjsndg5qbd5glq-nixos-test-driver-plpgsql_check.drv
  /nix/store/hklb438f0r32b420g6myddrc14k2i65p-vm-test-run-plpgsql_check.drv