Add alternative mode for System Rescue with 'rootpass' as MAC address

[antonym]

Related to #1441

Adds a new menu entry to the System Rescue CD Tools menu in roles/netbootxyz/templates/menu/systemrescue.ipxe.j2 to enable setting the 'rootpass' boot parameter to the device's MAC address.

• New Menu Entry: Introduces an option labeled "Enable rootpass=MAC_ADDRESS" that allows users to set the 'rootpass' boot parameter to their device's MAC address for easier access.
• Toggle Functionality: Implements a toggle mechanism that enables or disables the 'rootpass' parameter based on the user's selection from the menu. This is achieved through a conditional check that sets or unsets the rootpass_enabled flag and the params variable accordingly.
• Dynamic Parameter Setting: Modifies the boot command to dynamically include the rootpass parameter with the MAC address value when the option is enabled by the user.

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For more details, open the Copilot Workspace session.

[lars18th]

Hi @antonym ,

Thank you for incorporating my idea suggested in #1440 .

However, the current implementation prints in the screen menu Enable rootpass=MAC_ADDRESS. While the idea is to print the current MAC address: Enable rootpass=00aabbcc1122. You can check my original dirty implementation in https://github.com/lars18th/netboot.xyz-custom/blob/master/custom.ipxe

This has sense because with multiple NICs the MAC ADDRESS could not be clear.

I hope you will want to improve this.
Regards.

[lars18th]

ping @antonym