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Closes #654
Currently, rails supports only single preview path: https://github.com/rails/rails/blob/af0733a8e7ceddf6b9128ad2aaf4f74c5b427c43/actionmailer/lib/action_mailer/railtie.rb#L28
In the future, this will change: rails/rails#31595
So I created
PreviewPaths
config as an array.