these 2 derivations will be built:
  /nix/store/y32s7slnprnn1llc1rlrc7rksvk9d6mq-nixos-test-driver-plpgsql_check.drv
  /nix/store/39gj4c0vqpvkacqyp8l9spmxvz1kgyv6-vm-test-run-plpgsql_check.drv