these 2 derivations will be built:
  /nix/store/bwrlachfxbj3l4mcm2bimr6pw1kl2qkn-nixos-test-driver-wal2json.drv
  /nix/store/kmv9kbpz4is30rrzxq21z8i9h99vwnjb-vm-test-run-wal2json.drv