these 2 derivations will be built:
  /nix/store/j43an4i29ia5siyc7lpy914vjfzfl5kr-nixos-test-driver-plpgsql_check.drv
  /nix/store/2vipqqs6dng5fk4w9pq6qj1pmr69ni8v-vm-test-run-plpgsql_check.drv