I’ve just went through the process and installed Debian with HA (and a few others) in Docker container. It turned out to take quite a lot of space and I was left with not much free space. So I’ve removed the swap partition and now it has ~2GB free space. This is just enough to be able to upgrade HA as the image is taking well over 1GB. Overall the installation with Debian is super smooth and boots up nicely without any tinkering.
Then I’ve tried to get something smaller and I’ve installed Alpine Linux. With automated install it creates a 2GB swap partition. To get rid of it is a bit of manual disk partitioning as there is no wizard type of process in the install scripts. I’ve reduced the size of swap partition and now I have 6.2 GB root partition with ~3GB free space. So 1GB more than the Debian install.
Both work all ok now, they use up to 1GB memory (HA ~300MB only). I’ll probably put the alpine version to production location (secondary one, need just a few devices, remote access etc)
BTW, this terminal is great, 10x10x3cm and takes only 3W on average and 4W under load