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BalenaOS is also really good for this: https://www.balena.io/os/

Ubuntu for the RPi also uses cloud-init. I use it create a default user with my username instead of the ubuntu user, deploy ssh keys, install packages and configure the network on newly deployed Pi's.

that is interesting, thanks!

sounds like a super smooth dev and deploy experience

Docker on ARM is not a smooth experience. Hardly anyone builds containers for ARM so you end up either building everything yourself or finding weird -arm versions of popular containers.

have you seen this? https://hub.docker.com/u/arm32v7