these 2 derivations will be built:
  /nix/store/wz923wwzv78wfhkjnzp6azw3sdcskjbm-nixos-test-driver-plpgsql_check.drv
  /nix/store/3z2p3qd2xgkja1r8739nsl88viiwqlgm-vm-test-run-plpgsql_check.drv