build a fuchsia persistent disk

    usage: fx make-fuchsia-vol [-include-keys]
      -include-keys add the authorized public keys configured
                    to the Zircon ZBI as authorized_keys

[make-fuchsia-vol source code](https://cs.opensource.google/fuchsia/fuchsia/+/main:tools/devshell/contrib/make-fuchsia-vol)