these 2 derivations will be built:
  /nix/store/hpi10bqhkxlm55sff31p9n9aw5qgdw1k-nixos-test-driver-plpgsql_check.drv
  /nix/store/6csw5l0ghaz8bxavi1bv5l9ffz96339l-vm-test-run-plpgsql_check.drv