Track Rails errors on boot

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I've previously documented something about it here: https://docs.appsignal.com/ruby/integrations/rails.html#error-reporting-during-start-up

But we should look into if we want to offer this by default. Which I think would be a good idea.

To do

• Research how we can hook into Rails' start up/boot process and track any errors that occur at this time.
  • We probably want to track errors from before our "railtie" is loaded. Maybe even before AppSignal is normally loaded. Maybe we need to load AppSignal earlier in this scenario. Timebox this research for a day and update the team if you're stuck.
• Add this scenario to one of the test apps.
• Update blog team about this new feature, it's something we can release a minor release for.
• Update documentation page

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https://app.intercom.com/a/apps/yzor8gyw/inbox/inbox/conversation/16410700085776

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We report errors with the Ruby at_exit hook in Ruby gem 4. As long as AppSignal has started before an error occurs, we will report errors that crash Rails.

Closing.