As far as I know, this repository holds the earliest known build scripts for creating a Kali Linux Docker image, with its first commit dating back to January 2014.
It was responsible for building the first public Kali Linux image on Docker Hub as far as I remember, linux/kali. It was also this image that was initially used in the official repisotory
It was used by me to automate security scans in Continious Deploy pipelines and other things.
The script found here is nearly identical to the one first committed to the official kali-docker build scripts repository in May 2015. This repository is kept as a historical record of the original work.
The official and current repository for building the Kali Linux Docker image is located at: https://gitlab.com/kalilinux/build-scripts/kali-docker