Integrate danger

.github/workflows/danger.yml

@@ -0,0 +1,29 @@
+name: Danger
+
+on:
+  pull_request:
+    types: [synchronize, opened, reopened, labeled, unlabeled, edited]
+
+env:
+  LC_CTYPE: en_US.UTF-8
+  LANG: en_US.UTF-8
+
+jobs:
+  run-danger:
+    runs-on: ubuntu-latest
+    steps:
+      - name: ruby setup
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: 3.1.4
+          bundler-cache: true
+      - name: Checkout code
+        uses: actions/checkout@v2
+      - name: Setup gems
+        run: |
+          gem install bundler
+          bundle install --clean --path vendor/bundle
+      - name: danger
+        env:
+          DANGER_GITHUB_API_TOKEN: ${{ secrets.DANGER_GITHUB_API_TOKEN }}
+        run: bundle exec danger --verbose