def extract_variables(variable)
      return [variable] if variable.is_a? Hash
      return extract_variables_from_string(variable) if variable.is_a? String

      []
    end
def extract_variables(variable)
      return [variable] if variable.is_a? Hash
      return extract_variables_from_string(variable) if variable.is_a? String

      []
    end
Extract environment variables from a value
 The value is expected to be either a hash or a string with
 one or more key value pairs on the form
   KEY=VALUE