Add :site Option to beacon_live_admin to Allow Scoping and Multiple Admins per Router

[Arzamendiaariel]

It would be helpful if beacon_live_admin could accept a :site option to scope the admin interface to a specific site. Additionally, this feature should support defining multiple admin interfaces per router. This enhancement will improve flexibility and support more complex multi-tenant or multi-site applications.

Proposed Use Case:

For example, in my application, I would like to define two different admin interfaces:

One scoped to agencies, using a site specific to the agency:

scope "/agencies/:agency_id/admin", MyAppWeb, as: :agency_admin do
  pipe_through [:browser, :agency_admin]
  beacon_live_admin "/",
    site: :agency_site,
    repo: MyApp.Repo,
    endpoint: MyAppWeb.Endpoint,
    router: MyAppWeb.Router
end

Another general admin interface for the entire application:

scope "/admin", MyAppWeb do
  pipe_through [:browser, :general_admin]
  beacon_live_admin "/",
    site: :general_site,
    repo: MyApp.Repo,
    endpoint: MyAppWeb.Endpoint,
    router: MyAppWeb.Router
end

Benefits:

Allow scoping of admin interfaces to specific sites for better multi-site management. Enable defining multiple beacon_live_admin instances within the same application, addressing use cases for multi-tenancy and granular admin interfaces. Proposed Implementation:

Add support for a :site option in the beacon_live_admin macro. Ensure compatibility with existing options like repo, endpoint, and router. Allow configuration of multiple admins per router, scoped as needed. Potential Challenges:

Handling overlapping configurations when multiple admin scopes exist in the same application. Ensuring backward compatibility for existing implementations. Conclusion:

This feature would greatly enhance the flexibility and applicability of beacon_live_admin for projects requiring scoped admin interfaces and multiple admin setups. I’d be happy to discuss further or help with implementation if needed.

Thank you for considering this feature request!

[leandrocp]

Related to #272