Add danger for rubocop

.github/workflows/danger.yml

@@ -0,0 +1,17 @@
+name: Run Danger on PRs
+
+on:
+  pull_request:
+    types: [opened, synchronize]
+
+jobs:
+  danger:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: ruby/setup-ruby@v1
+        with:
+          bundler-cache: true # runs 'bundle install' and caches installed gems automatically
+      - run: bundle exec danger
+        env:
+          DANGER_GITHUB_API_TOKEN: ${{ secrets.GITHUB_TOKEN }}

Dangerfile

@@ -0,0 +1,6 @@
+# frozen_string_literal: true
+
+# vi: ft=ruby
+
+github.dismiss_out_of_range_messages
+rubocop.lint inline_comment: true

Gemfile

@@ -12,4 +12,6 @@ group :development, :test do
   gem "rubocop"
   gem "rubocop-rspec"
   gem "timecop"
+
+  gem "danger-rubocop", "~> 0.13.0"
 end