Since the CT (the A20 one, not the CT+) has been moved to CSC status, I've build a 22.04/jammy minimal image for my CT, and I figured I might as well share it with you.
The only changes to "pure" armbian are some power management debug options in the kernel.
https://github.com/IGNNE/cubietruck-armbian-unofficial/releases/tag/22.04-2022-09-09
SHA256 of zip file: 9d0028a9f5c6258a739f52f447bf4400d20fec52358f5006ae8a26b602acdfc0