running on devuan 10 lxc container
sudo apt install gnupg apt-transport-https
curl -sSL https://archive.heckel.io/apt/pubkey.txt | sudo apt-key add -
sudo sh -c "echo 'deb [arch=amd64] https://archive.heckel.io/apt debian main' > /etc/apt/sources.list.d/archive.heckel.io.list"
sudo apt update && sudo apt install ntfy