Add RuboCop workflow

.github/workflows/rubocop.yml

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+# This workflow uses actions that are not certified by GitHub.
+# They are provided by a third-party and are governed by
+# separate terms of service, privacy policy, and support
+# documentation.
+# This workflow will download a prebuilt Ruby version, install dependencies and run tests with rspec.
+# For more information see: https://github.com/marketplace/actions/setup-ruby-jruby-and-truffleruby
+
+name: RuboCop
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+permissions:
+  contents: read
+
+jobs:
+  rubocop:
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v3
+    - name: Set up Ruby
+      uses: ruby/setup-ruby@v1
+      with:
+        ruby-version: 3.4
+        bundler-cache: false
+
+    - name: Install gems
+      run: bundle install
+
+    - name: Run RuboCop
+      # Use -c flag so we ignore config files used within rubocop-related fixtures
+      run: bundle exec rubocop -c .rubocop.yml

.rubocop.yml

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+---
+inherit_from: .rubocop_todo.yml
+
+# The behavior of RuboCop can be controlled via the .rubocop.yml
+# configuration file. It makes it possible to enable/disable
+# certain cops (checks) and to alter their behavior if they accept
+# any parameters. The file can be placed either in your home
+# directory or in some project directory.
+#
+# RuboCop will start looking for the configuration file in the directory
+# where the inspected file is and continue its way up to the root directory.
+#
+# See https://docs.rubocop.org/rubocop/configuration
+AllCops:
+  NewCops: enable
+  Exclude:
+    - "spec/fixtures/invalid_byte.rb"
+    - "spec/fixtures/invalid_node_comment.rb"
+    - "spec/fixtures/invalid_utf8.rb"
+  TargetRubyVersion: 3.0
+
+Style/MethodDefParentheses:
+  EnforcedStyle: require_no_parentheses
+
+Layout/EmptyLineAfterGuardClause:
+  Enabled: false
+
+Metrics/MethodLength:
+  Max: 25
+
+plugins:
+  - rubocop-rspec
+  - rubocop-rake