[FIX]: install-freisa.sh: List ALL assigned IP addresses

[gmacario]

📑 Description

The hostname command was incorrectly using the the -i (lowercase) option which returned only one IP address.

Replace it with -I (uppercase) to list all the assigned IP addresses.

✅ Checks

• [x] My pull request adheres to the code style of this project
• [x] My code requires changes to the documentation
• [x] I have updated the documentation as required
• [x] All the tests have passed

ℹ Additional Information

Reference: https://manpages.ubuntu.com/manpages/jammy/man1/hostname.1.html

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