these 2 derivations will be built:
  /nix/store/x6ni92bpcwg7k9wirpnvvaccb8614b82-nixos-test-driver-plpgsql_check.drv
  /nix/store/n6mnka1jffwjv9fff187r3z6ic28hsih-vm-test-run-plpgsql_check.drv