$ curl -s https://freexian-team.pages.debian.net/debusine/repository/public-key.asc \
  | sudo tee /etc/apt/trusted.gpg.d/debusine.asc
$ sudo tee /etc/apt/sources.list.d/debusine.list <<END
deb [arch=all] https://freexian-team.pages.debian.net/debusine/repository/ bookworm main
END
$ sudo apt update