/usr/share/live/images/rescue/auto/config is in live-image-rescue 4.0~a5-1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 | #!/bin/sh
set -e
lb config noauto --clean --ignore-system-defaults --mode debian --debian-installer live "${@}"
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