Merge branch 'sh-cache-rubocop-cwd' into 'master'

Cache current working directory to speed up Rubocop

Closes #61383

See merge request gitlab-org/gitlab-ce!28066

rubocop/qa_helpers.rb

@@ -5,7 +5,7 @@ module RuboCop
     def in_qa_file?(node)
       path = node.location.expression.source_buffer.name
 
-      path.start_with?(File.join(Dir.pwd, 'qa'))
+      path.start_with?(File.join(RuboCop::PathUtil.pwd, 'qa'))
     end
   end
 end

rubocop/spec_helpers.rb

@@ -6,14 +6,16 @@ module RuboCop
     # Returns true if the given node originated from the spec directory.
     def in_spec?(node)
       path = node.location.expression.source_buffer.name
+      pwd = RuboCop::PathUtil.pwd
 
       !SPEC_HELPERS.include?(File.basename(path)) &&
-        path.start_with?(File.join(Dir.pwd, 'spec'), File.join(Dir.pwd, 'ee', 'spec'))
+        path.start_with?(File.join(pwd, 'spec'), File.join(pwd, 'ee', 'spec'))
     end
 
     def migration_directories
       @migration_directories ||= MIGRATION_SPEC_DIRECTORIES.map do |dir|
-        [File.join(Dir.pwd, dir), File.join(Dir.pwd, 'ee', dir)]
+        pwd = RuboCop::PathUtil.pwd
+        [File.join(pwd, dir), File.join(pwd, 'ee', dir)]
       end.flatten
     end