Signing
To sign packages automatically using a GPG key add the following to your configuration file:
gpg_key: /absolute/path/to/the/private/key
gpg_name: Packager Name # must be the same as the `Name` field on the key
When pkger detects the gpg key in the configuration it will prompt for a password to the key on each run.
Currently, only deb and rpm targets support signing.