pacman-key: add page (#6474)

pages/linux/pacman-key.md

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+# pacman-key
+
+> Wrapper script for GnuPG used to manage pacman's keyring.
+> More information: <https://man.archlinux.org/man/pacman-key>.
+
+- Initialize the pacman keyring:
+
+`sudo pacman-key --init`
+
+- Add the default ArchLinux keys:
+
+`sudo pacman-key --populate {{archlinux}}`
+
+- List keys from the public keyring:
+
+`pacman-key --list-keys`
+
+- Add the specified keys:
+
+`sudo pacman-key --add {{path/to/keyfile.gpg}}`
+
+- Receive a key from a key server:
+
+`sudo pacman-key --recv-keys "{{uid|name|email}}"`
+
+- Print the fingerprint of a specific key:
+
+`pacman-key --finger "{{uid|name|email}}"`
+
+- Sign an imported key locally:
+
+`sudo pacman-key --lsign-key "{{uid|name|email}}"`
+
+- Remove a specific key:
+
+`sudo pacman-key --delete "{{uid|name|email}}"`