Add signing key to apt without mass deps

For some odd reason, lots of 3rd party package repos want you to install software-properties-common and dirmngr just to add a gnupg signing key to the aptitude keyring. This really annoys me when a single line use of wget works just fine?!

wget -q -O - https://mariadb.org/mariadb_release_signing_key.asc | apt-key add -
OK

This completely replaces the recommended method:

sudo apt-get install software-properties-common dirmngr
sudo apt-key adv --fetch-keys 'https://mariadb.org/mariadb_release_signing_key.asc'