Add The Linuxfabrik Monitoring Plugins Collection

See https://github.com/Linuxfabrik/monitoring-plugins

And https://repo.linuxfabrik.ch/monitoring-plugins/

wget https://repo.linuxfabrik.ch/linuxfabrik.key --output-document=/etc/apt/keyrings/linuxfabrik.asc
source /etc/os-release
echo "deb [signed-by=/etc/apt/keyrings/linuxfabrik.asc] https://repo.linuxfabrik.ch/monitoring-plugins/debian/ $VERSION_CODENAME-release main" > /etc/apt/sources.list.d/linuxfabrik-monitoring-plugins.list
apt update
apt install linuxfabrik-monitoring-plugins