Zend certified PHP/Magento developer

Magento Cloud Docker build ARM64 images for existing project

I have an existing Magento Commerce Cloud Project and I used to develop locally with the Magento Cloud Docker.
So far I have used the Magento-generated file docker-compose.yml, and I was almost ready to go with Docker.
Now I am working with an Apple M1 Chip (ARM64) and I see that I would have to build the Docker Images myself. Here are some bullets how to from github#326
Since I am not very deep into Docker, I would need some hints on how to do that in my existing project. Can somebody help, please? Thanks!