ActionMailer / Rails: No paths in my mails please

Always paying attention that mails only use urls is a bit annoying/dangerous and also means we cannot reuse partials and cannot use nice resource routes like `link_to, user`

Make ActionMailer always use full urls:

# we only want urls in our emails, never paths
module OnlyAbsoluteUrls
  def url_for(*args)
    url = super
    if url.include?("://")

class ApplicationMailer < ActionMailer::Base
  helper OnlyAbsoluteUrls

and to make sure it works let’s verify in all mailer tests that we did not actually generated paths:

after { '"/' }

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