these 2 derivations will be built:
  /nix/store/866i5hps8m411yci776sylsqdbn5n37g-nixos-test-driver-plpgsql_check.drv
  /nix/store/w6zmqxx8y3bpxs410rafyysjs16q4lds-vm-test-run-plpgsql_check.drv