Modernize APT keyrings on Debian family #339
Description
Debian 12 now warn when storing keys in the deprecated trusted.gpg keyring:
W: mirror://mirrorlists.choria.io/apt/release/debian/bullseye/mirrors.txt/dists/debian/InRelease: Key is stored in legacy trusted.gpg keyring (/etc/apt/trusted.gpg), see the DEPRECATION section in apt-key(8) for details.
We can use the work done in the puppetlabs-apt module to store the key in a dedicated file that is only used by this specific repository.