How to Create a Basic PubSub Application

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lib/app_name/application.ex

def start(_type, _args) do
    children = [
      # Start the Telemetry supervisor
      AppWeb.Telemetry,
      # Start the Ecto repository
      App.Repo,
      # Start the PubSub system
      {Phoenix.PubSub, name: App.PubSub},

    ]

...
end