fix: CD 배포를 인스턴스별 순차 롤링 방식으로 변경 (#690)

[GANGHYEON02]

Closes #690

변경 내용

• cd.yml: 전체 인스턴스 동시 SSM 배포 → 인스턴스 1대씩 순차 처리로 변경
  • deregister-targets → 드레이닝 대기(wait target-deregistered) → 해당 인스턴스에만 SSM 배포 → 완료 대기(wait command-executed) → register-targets → 헬스체크 통과 대기(wait target-in-service) → 다음 인스턴스
• deploy.sh는 변경 없음 (인스턴스 1대 배포 스크립트 역할 그대로)

⚠️ 머지 전 필수 확인

• hard-click-ci-deploy-role에 IAM 권한 추가 필요 (콘솔에서 직접):
  elasticloadbalancing:DescribeTargetGroups, DescribeTargetHealth, DeregisterTargets, RegisterTargets, ssm:GetCommandInvocation
• 권한 추가 후 실제 main 배포 1회로 롤링 동작 확인

체크리스트

• 로컬 빌드 통과 (./gradlew build) — 해당 없음, 워크플로 YAML만 변경
• Flyway 파일 포함 여부 확인 — 해당 없음
• ddl-auto: update 없음
• MinIO 설정 없음
• InfluxDB 설정 없음

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feature/#690-cd-rolling-deploy

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[github-actions]

Test Results

0 tests  ±0   0 ✅ ±0   0s ⏱️ ±0s
0 suites ±0   0 💤 ±0 
0 files   ±0   0 ❌ ±0 

Results for commit c96081f. ± Comparison against base commit d6fb130.

[github-actions]

Gate 1 · 결정론 규칙

16 tests  ±0   16 ✅ ±0   0s ⏱️ -1s
 3 suites ±0    0 💤 ±0 
 3 files   ±0    0 ❌ ±0 

Results for commit c96081f. ± Comparison against base commit d6fb130.

[github-actions]

Gate 2 · 결정론 판정

88 tests  ±0   82 ✅ ±0   0s ⏱️ ±0s
29 suites ±0    6 💤 ±0 
29 files   ±0    0 ❌ ±0 

Results for commit c96081f. ± Comparison against base commit d6fb130.