Merge pull request #8566 from reitermarkus/rubocop-dots

Adjust RuboCop formatter on CI.

Library/Homebrew/style.rb

@@ -118,6 +118,12 @@ module Homebrew
       case output_type
       when :print
         args << "--debug" if debug
+
+        if ENV["CI"]
+          # Don't show the default formatter's progress dots on CI.
+          args << "--format" << "clang"
+        end
+
         args << "--color" if Tty.color?
 
         system cache_env, "rubocop", *args