these 2 derivations will be built:
  /nix/store/04an6xsnbmmqngnzk5547994cgq12iz2-nixos-test-driver-plpgsql_check.drv
  /nix/store/b98j5jlqmiqkrfssx2yn8glygr3qlagg-vm-test-run-plpgsql_check.drv