Add rubocop tasks

Author: sue445

.github/workflows/test.yml

@@ -39,6 +39,7 @@ jobs:
       - run: sudo apt-get install -y universal-ctags
 
       - run: bundle exec rspec
+      - run: bundle exec rubocop
 
       - name: Slack Notification (not success)
         uses: act10ns/slack@v2

Rakefile

@@ -5,4 +5,8 @@ require "rspec/core/rake_task"
 
 RSpec::Core::RakeTask.new(:spec)
 
+require "rubocop/rake_task"
+
+RuboCop::RakeTask.new
+
 task default: :spec