Add standard workflow for running RuboCop

.github/workflows/rubocop.yml

@@ -0,0 +1,28 @@
+# frozen_string_literal: true
+
+# This file is synced from dry-rb/template-gem repo
+
+name: RuboCop
+
+on: [push, pull_request]
+
+permissions:
+  contents: read
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    env:
+      BUNDLE_ONLY: tools
+
+    steps:
+    - uses: actions/checkout@v3
+
+    - name: Set up Ruby 3.2
+      uses: ruby/setup-ruby@v1
+      with:
+        ruby-version: 3.2
+        bundler-cache: true
+
+    - name: Run RuboCop
+      run: bundle exec rubocop --parallel