chore: suppress config location on default-dkim-record

script/default_dkim_record.rb

@@ -1,4 +1,5 @@
 # frozen_string_literal: true
 
+ENV["SILENCE_POSTAL_CONFIG_LOCATION_MESSAGE"] = "true"
 require File.expand_path("../lib/postal/config", __dir__)
 puts Postal.rp_dkim_dns_record