Actually, we had manual install steps as the only way to go for a while. You'd be surprised at how many people asked for a one-liner... I'm going to add a note to the docs about that, since I've seen a couple of comments here of people who were put off by it and didn't even read the rest.

I actually only install piku via cloud-init, but there are plenty more options: https://piku.github.io/install/index.html