these 2 derivations will be built:
  /nix/store/qf8j0wcd64hhdr2b90j247fcx7pxdhx2-nixos-test-driver-pgroonga.drv
  /nix/store/fjxig7yamg6axid52bw3vg4pdps3q8y2-vm-test-run-pgroonga.drv