these 2 derivations will be built:
  /nix/store/6saa9rz82z51wc3bd6jh07als5w3f2kd-nixos-test-driver-plpgsql_check.drv
  /nix/store/bn141zw5jf8j45ka6cirpg0vxad8zm81-vm-test-run-plpgsql_check.drv