Add apt-key for managing system trusted GPG keys.

pages/linux/apt-key.md

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+# apt-key
+
+> Key management utility for the APT Package Manager on Debian and Ubuntu
+
+- List trusted keys
+
+`apt-key list`
+
+- Add a key to the trusted keystore
+
+`apt-key add {{public_key_file.asc}}`
+
+- Delete a key from the trusted keystore
+
+`apt-key del {{key_id}}`
+
+- Add a remote key to the trusted keystore
+
+`wget -qO - {{https://host.tld/filename.key}} | apt-key add -`