these 2 derivations will be built:
  /nix/store/9dr25bgdjd32gj3c6njdaw3818lp92i7-nixos-test-driver-plpgsql_check.drv
  /nix/store/6jkdyf4axv3qilxy4z6sxk954d8j6mvy-vm-test-run-plpgsql_check.drv