ci: add merge_group trigger to integration workflow

Author: DaleSeo

.github/workflows/integration.yaml

@@ -2,6 +2,7 @@ name: Integration 🔄
 
 on:
   pull_request:
+  merge_group:
 
 jobs:
   linelint:
@@ -17,11 +18,11 @@ jobs:
         run: |
           echo "🔍 PR 번호: ${{ github.event.pull_request.number }}"
           pr_number="${{ github.event.pull_request.number }}"
-          
+
           echo "📋 PR 라벨 조회 중..."
           labels_json=$(gh pr view $pr_number --json labels -q '.labels[].name')
           echo "확인된 라벨: $labels_json"
-          
+
           if [ -n "$labels_json" ]; then
             has_maintenance=$(echo $labels_json | grep -q 'maintenance' && echo 'true' || echo 'false')
             echo "maintenance 라벨 포함 여부: $has_maintenance"