apt install gnupg
wget https://dev.mysql.com/get/mysql-apt-config_0.8.9-1_all.deb
dpkg -i mysql-apt-config_0.8.9-1_all.deb
apt-key adv --keyserver keys.gnupg.net --recv-keys 8C718D3B5072E1F5

Copy/download the GPG key from https://dev.mysql.com/doc/refman/8.0/en/checking-gpg-signature.html

Save that into a file on the Debian server as mysql.pub

sudo apt-key add mysql.pub    

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