initial-base is the correct one. I will add the docker files for homeassistant shortly.
arecord -l should return something. The system needs one or two reboots at start for the installation. It needs internet access and give it like 15min after each reboot. Will test the image with that board tomorrow.
I am currently working on the new board. And that is fully working now.
There is less documentation because i started with the documentation in wyoming-satellite/docs/tutorial_docker.md at feature/add-docker-build · florian-asche/wyoming-satellite · GitHub but the thing is so big now, i will move it to picompose, maybe i create a new repo.
I will add a new image today with the docker-compose files. The compose system is documented in the repository.