bugsnag-ruby: Difficulty configuring Bugsnag in Rails before it configures itself

Here’s an example initializer in Rails:

# config/initializers/bugsnag.rb
puts "Bugsnag initializer reached"
Bugsnag.configure do |config|
  config.logger = Logger.new("/dev/null")
  config.api_key = ENV.fetch("BUGSNAG_API_KEY")
end

The Bugsnag ready message gets logged before this initializer runs:

$ rails c
** [Bugsnag] Bugsnag exception handler 5.5.0 ready
Bugsnag initializer reached
Loading development environment (Rails 5.1.4)

I want to change the Bugsnag logger and/or explicitly configure Bugsnag myself. I do not want the gem to try to automatically detect its own configuration. What is the correct way to do this in Rails and other Ruby environments when using Gemfiles/Rubygems to load this gem?