[openstreetmap/openstreetmap-website] Expose smtp config (#2571)

[Kevin Greene]

Thank you for the help! I got it to work with the following lines in my Dockerfile:

```bash
echo "
Rails.application.configure do
  # Override the default settings loaded in config/initializers/action_mailer.rb.
  config.after_initialize do
    ActionMailer::Base.delivery_method = :smtp
    ActionMailer::Base.smtp_settings = {
      :address => 'smtp.mailgun.org',
      :port => 587,
      :domain => 'mywebsite.com',
      :user_name => '${OSM_MAILGUN_USERNAME}',
      :password => '${OSM_MAILGUN_PASSWORD}',
      :authentication => 'plain',
      :enable_starttls_auto => true,
    }
  end
end" >> "config/environments/production.rb"
```

It feels a bit weird to patch the production.rb file, but I couldn't figure out a better way.

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