This file is indexed.

/etc/initramfs/post-update.d/zz-flash-touch-initrd is in initramfs-tools-ubuntu-touch 0.72.

This file is owned by root:root, with mode 0o755.

The actual contents of the file can be viewed below.

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#!/bin/sh

# we dont want to run if FLASH_KERNEL_SKIP is set, the ubuntu
# image build system uses this
if [ -n "$FLASH_KERNEL_SKIP" ]; then
    exit 0
fi

/usr/sbin/flash-touch-initrd /boot/initrd.img-$1