[openstreetmap/openstreetmap-website] Enable ActionMailer Previews (PR #6449)

[Pablo Brasero]

@pablobm approved this pull request.

This is really clever, in the good sense 👍

> @@ -0,0 +1,25 @@
+# frozen_string_literal: true
+
+require "factory_bot_rails"
+
+class UserMailerPreview < ActionMailer::Preview
+  include FactoryBot::Syntax::Methods
+
+  # Wraps the preview in a transaction, so that no changes
+  # are persisted to the development db
+  def self.call(...)

6 years after being made available in the language, TIL about argument forwarding with `...` 😳 I have always used `*` and variants, but this seems easier.

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