To use this repository, you need to run this to get my GPG key

  gpg --keyserver keyring.debian.org --recv-keys 900CB024B67931D40F82304BD0178C767D069EE6
  gpg -a -o /tmp/sthibault.asc --export 900CB024B67931D40F82304BD0178C767D069EE6
  sudo cp /tmp/sthibault.asc /etc/apt/keyrings/sthibault.asc

and add this as /etc/apt/sources.list.d/sthibault-unreleased.sources:

Types: deb
URIs: https://people.debian.org/~sthibault/unreleased
Suites: ./
Signed-By: /etc/apt/keyrings/sthibault.asc

and then you can install packages like this:

  sudo apt update
  sudo apt install somepackage/unreleased-sthibault