Setup Rubocop

.github/workflows/rubocop.yml

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+name: "Rubocop"
+
+on:
+  push:
+    branches: [ "master" ]
+  pull_request:
+    branches: [ "master" ]
+
+jobs:
+  rubocop:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v3
+
+    - name: Set up Ruby
+      uses: ruby/setup-ruby@v1
+      with:
+        ruby-version: 2.6
+
+    # This step is not necessary if you add the gem to your Gemfile
+    - name: Install Code Scanning integration
+      run: bundle add code-scanning-rubocop --version 0.3.0 --skip-install
+
+    - name: Install dependencies
+      run: bundle install
+
+    - name: Rubocop run
+      run: |
+        bash -c "
+          bundle exec rubocop --require code_scanning --format CodeScanning::SarifFormatter -o rubocop.sarif
+          [[ $? -ne 2 ]]
+        "
+
+    - name: Upload Sarif output
+      uses: github/codeql-action/upload-sarif@v2
+      with:
+        sarif_file: rubocop.sarif