these 2 derivations will be built:
  /nix/store/1yjz2dyl1v9cf938pyflmly4hbg92094-nixos-test-driver-plpgsql_check.drv
  /nix/store/iphyjba7fxw1a9n0kysq4ykpzba3kfpz-vm-test-run-plpgsql_check.drv