these 2 derivations will be built:
  /nix/store/3jdykp8j5r86c31vs0h20ss5bymvf16z-nixos-test-driver-pgroonga.drv
  /nix/store/7w20y5wm3g9wkd0ja5qd61ld6xg8amqb-vm-test-run-pgroonga.drv