Package repository

Add the signing key and this repo, matching your Debian release:

curl -fsSL https://YOUR_USER.github.io/YOUR_REPO/pubkey.gpg | sudo gpg --dearmor -o /usr/share/keyrings/yourrepo.gpg
echo "deb [signed-by=/usr/share/keyrings/yourrepo.gpg] https://YOUR_USER.github.io/YOUR_REPO/apt CODENAME main" | sudo tee /etc/apt/sources.list.d/yourrepo.list
sudo apt update