Disable simplecov on CircleCI (#7416)

* Disable simplecov on CircleCI

* Remove --format progress

.circleci/config.yml

@@ -11,6 +11,7 @@ aliases:
           RAILS_ENV: test
           PARALLEL_TEST_PROCESSORS: 4
           ALLOW_NOPAM: true
+          DISABLE_SIMPLECOV: true
     working_directory: ~/projects/mastodon/
 
   - &attach_workspace

spec/spec_helper.rb

-require 'simplecov'
-
 GC.disable
 
-SimpleCov.start 'rails' do
-  add_group 'Services', 'app/services'
-  add_group 'Presenters', 'app/presenters'
-  add_group 'Validators', 'app/validators'
+if ENV['DISABLE_SIMPLECOV'] != 'true'
+  require 'simplecov'
+  SimpleCov.start 'rails' do
+    add_group 'Services', 'app/services'
+    add_group 'Presenters', 'app/presenters'
+    add_group 'Validators', 'app/validators'
+  end
 end
 
 gc_counter = -1