Phoenix/Elixir: Generate Guardian secret_key with Jose

While we will have to change this in our production setup, if we are just testing Guardian locally, we can generate a secret_key with this following command:

First ensure that we have added Guardian to the application by adding it to mix.exs

defp deps do
  [
    # ...
    {:guardian, "~> 0.13.0"}
    # ...
  ]
end

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