Github workflow for Rubocop

.github/workflows/rubocop.yml

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+name: Rubocop
+
+on: [pull_request]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v1
+
+    # Extract the Ruby version from the Gemfile.lock
+    - name: 'Determine Ruby Version'
+      run: echo ::set-env name=RUBY_VERSION::$(echo `cat ./Gemfile.lock | grep -A 1 'RUBY VERSION' | grep 'ruby' | grep -oE '[0-9]\.[0-9]'`)
+
+    # Install Ruby - using the version found in the Gemfile.lock
+    - name: 'Install Ruby'
+      uses: actions/setup-ruby@v1
+      with:
+        ruby-version: ${{ env.RUBY_VERSION }}
+
+    # Will run Rubocop checks on the PR diffs and report any errors as commentary on the PR
+    - name: Octocop
+      uses: Freshly/Octocop@v0.0.1
+      with:
+        github_token: ${{ secrets.github_token }}
+        rubocop_flags: "-c ./rubocop.yml"