these 2 derivations will be built:
  /nix/store/ja408y33d34p85hc2wl3qhiq0kc11i4s-nixos-test-driver-wal2json.drv
  /nix/store/n1h80dk0njvzmnij4av1qwr0qsh04830-vm-test-run-wal2json.drv