Customize Curtin scripts

If I am not mistaken, we are doing exactly what is asked here, as mentioned in Passing tags from MAAS to a deployed server. - #2 by gregoryo2017

I don’t recall how long we’ve been doing it, but I reckon it’s quite some years.

I’m actually here because I am trying to find out where I got the reference for doing that! We can get zone and tags, and I want pool too. Perhaps I’ll just try it and see what happens.