these 2 derivations will be built:
  /nix/store/4nz2jwq2j7fg4pmasrz9nccbjw44h3im-nixos-test-driver-plpgsql_check.drv
  /nix/store/3yz0gl83sc3adb2w11a0lp0br9qk92bw-vm-test-run-plpgsql_check.drv