Implements a new module for backing up LNbits data using Borg.
This module automates hourly backups, encrypts the data, and provides point-in-time recovery. It includes scripts for listing, restoring, and mounting backups. A comprehensive setup guide is provided in the documentation.
The configuration allows specifying the Borg repository location, schedule, compression settings, retention policy, and SSH key for secure access.
Updated shared.nix to enhance domain parameter propagation and modified configuration.nix to utilize the inherited domain for machine-specific setups. Adjusted example-service.nix to accept the domain as an argument, improving modularity. Additionally, added a new documentation file explaining the LNBits flake deployment process, detailing architecture, key components, and deployment instructions for better onboarding and understanding of the system.
