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This is the one I use to host on a vps. No clue on it's deployability on a pi.
https://github.com/ubergeek77/Lemmy-Easy-Deploy
It's auto installs and updates. Just need to forward the DNS for your instance to whatever domain name you like. It's pretty straight forward from the documentation.
Don't forget, that SCOTUS also gave themselves the right of judicial review out of thin air.