wget -O icinga-archive-keyring.deb "https://packages.icinga.com/icinga-archive-keyring_latest+debian$(
. /etc/os-release; echo "$VERSION_ID").deb"
apt install ./icinga-archive-keyring.deb
DIST=$(awk -F"[)(]+" '/VERSION=/ {print $2}' /etc/os-release)
echo "deb [signed-by=/usr/share/keyrings/icinga-archive-keyring.gpg] https://packages.icinga.com/debian icinga-${DIST} main" \
> /etc/apt/sources.list.d/${DIST}-icinga.list
echo "deb-src [signed-by=/usr/share/keyrings/icinga-archive-keyring.gpg] https://packages.icinga.com/debian icinga-${DIST} main" \
>> /etc/apt/sources.list.d/${DIST}-icinga.list