設定 Linux 防火牆規則，允許 Fuchsia 裝置和模擬器流量。
Setup Linux uncomplicated firewall (ufw) to allow Fuchsia device and emulator traffic.
This command detects whether an active Linux firewall service is setup,
and if so, will add special rules to allow Fuchsia-specific traffic to
go through the link-local IPv6 network interfaces used by Fuchsia devices
and emulators.
NOTE: This script uses sudo and will thus ask for your password!
-n|--dry-run Just print all steps, don't do any configuration