setup_gpg_key: rename keys to have correct extension.
setup_gpg_key: rename keys to have correct extension.

We are exporting an armoured GPG key which by convention has a .asc
extension, the .gpg extension is usually designated for binary keys.

Signed-off-by: Chris Lapa <711c73f64afdce07b7e38039a96d2224209e9a6c@lapa.com.au>

GusBricker/fancy-sauce