these 2 derivations will be built:
  /nix/store/3mky8d33swjxmmwkql9g1s79xbjz91d1-nixos-test-driver-pgroonga.drv
  /nix/store/8l57d3w38ffxn63vk8crdcls8azsb0p0-vm-test-run-pgroonga.drv