Github source for Debian Engineering Releases?

I am trying to find the Github source and details on how to build SD card images for the Debian Engineering releases found here -
i.e where and how is starfive-jh7110-202308-SD-minimal-desktop.img being built?
I am looking to build minimal-server images.

Does anybody have any information?

Here are the detail steps on how to generate the images.
Building the Debian Image from scratch

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