/etc/initramfs/post-update.d/zz-flash-touch-initrd is in initramfs-tools-ubuntu-touch 0.94vivid5.
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 | #!/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
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