Load up Notus Advisories into redis.
It performs the signature check, the hashsum check and the upload.

Signature check is optional. It must be enabled with the command line option but also the environment variable to the gnupg keyring must be set.

Usage:
`GPGHOME=/path/to/.gnupg nasl-cli notus update --path <path-to-the-advisories> --signature-check`

Since it is no not only for Nvts but also for Notus advisories.

instead of having two subcommands.