Just so people are clear that they do not need to specify a $custom_key_dir to manage the debian archive keyring, I've added some clarifying text so you know that this is not necessary
where individual key files can be placed. If this is set and keys
exist there, this module will 'apt-key add' each key.
+The debian-archive-keyring package is installed and kept current up to the
+latest revision (this includes the backports archive keyring).
+
$apt_proxy / $apt_proxy_port
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