[Rails]ベーシック認証をコントローラーに書かない方法

config.ru

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class CustomizedRackAuth < Rack::Auth::Basic
  def call(env)
    request = Rack::Request.new(env)

    if request.path == '/health_checks'
      @app.call(env)
    else
      super
    end
  end
end

use CustomizedRackAuth do |username, password|
  username == ENV['BASIC_AUTH_USERNAME'] && password == ENV['BASIC_AUTH_PASSWORD']
end