ci.yml in paquito-0.4.0

- old
+ new

@@ -1,9 +1,24 @@
 name: CI
 
 on: [push, pull_request]
 
 jobs:
+  rubocop:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Set up Ruby
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: '2.7'
+          bundler-cache: true
+      - name: Run test
+        run: bundle exec rubocop
+
   rubies:
     runs-on: ubuntu-latest
     strategy:
       fail-fast: false
       matrix: