Security Option: Add Basic Auth

[nesimtunc]

Enable optional built-in basic auth plug for restriction web application

Example:

# lib/my_app_web/router.ex
use MyAppWeb, :router
import Plug.BasicAuth
import Phoenix.LiveDashboard.Router

...

pipeline :admins_only do
  plug :basic_auth, username: "admin", password: "a very special secret"
end

scope "/" do
  pipe_through [:browser, :admins_only]
  live_dashboard "/dashboard"
end

TODO:

• Get Basic Auth from Environment Values