these 2 derivations will be built:
  /nix/store/fkh7s7c9c91rjvr5p40vr06m9pq3z5za-nixos-test-driver-pgroonga.drv
  /nix/store/r5cdh8knpla15v68jdcmqcxbqf5jvqfw-vm-test-run-pgroonga.drv