/usr/share/doc/multistrap/examples/config.sh is in multistrap 2.2.0ubuntu1.
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 6 7 8 9 10 | #!/bin/sh
set -e
# This config script provides a method of adjusting the tarball
# contents after multistrap has completed.
# The script is copied into the tarball and unpacked to:
# /config.sh
# This example file can act as a skeleton for your own scripts.
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