title: Rspec always exits with code 1 when simplecov is enabled
body: <p>I have a Ruby on Rails 6.1 application I am testing with rspec 3.10, all tests passing and it exits with code 0. When I add Simplecov (using 0.21.2) the exit code is always 1.</p>
  <p>My simplecov configuration:</p>
  <pre><code># spec/rails_helper.rb
  require 'simplecov'
  if !ENV[&quot;NO_COVERAGE&quot;]
      SimpleCov.start :rails do
          minimum_coverage 0
          minimum_coverage_by_file 0
          filesize = Proc.new { |source_file| source_file.lines.count &lt; 10 }
          add_group &quot;Workers&quot;, &quot;/app/workers&quot;
          add_group &quot;Builders&quot;, &quot;/app/builders&quot;
          add_group &quot;Queries&quot;, &quot;/app/queries&quot;
          add_group &quot;Decorators&quot;, &quot;/app/decorators&quot;
      end
  end
  </code></pre>
  <p>Example output (from a Github action)</p>
  <pre><code>Finished in 4 minutes 18.1 seconds (files took 11.15 seconds to load)
  2415 examples, 0 failures, 154 pending
  
  Randomized with seed 29170
  
  Coverage report generated for RSpec to /app/coverage. 8665 / 13736 LOC (63.08%) covered.
  1
  Error: Process completed with exit code 1.
  </code></pre>
  <p>If I remove or disable simplecov everything works fine. If I turn it back on, exit code is always 1. This happens on GH Actions, my dev machine and inside Docker containers.</p>
  <p>Am I doing something wrong? How do I get simplecov to always return 0 since I don't care about minimum coverage anyway?</p>