these 2 derivations will be built:
  /nix/store/bm0xr5s2k8y3id964by3q083piiz58x4-nixos-test-driver-wal2json.drv
  /nix/store/7ykny2dnpkas5ns42hp3qnlqwbvx0x62-vm-test-run-wal2json.drv