ci: 상용 배포 트리거를 main push에서 git tag(v*)로 분리

[unam98]

작업 배경

Trunk-Based Development 전환(#236) 이후 staging(Render)과 상용(AWS CodeDeploy)이 둘 다 main push에 트리거돼서, merge하면 검증 없이 바로 상용까지 나가는 문제가 있었다. Continuous Delivery 패턴(merge는 항상 배포 가능한 상태만 보장, 상용 반영은 명시적 트리거)으로 분리한다.

변경 사항

영역	내용
prod-cd.yml	트리거를 push: branches: [main] → push: tags: ['v*']로 변경
README.md	배포 전략 섹션 추가 (staging/상용 트리거 분리 표, 태그 배포 절차)

영향 범위

• 이후로는 main에 push/merge해도 상용에 자동 반영되지 않는다. staging은 그대로 자동 배포됨.
• 상용에 반영하려면 git tag v1.x.x && git push origin v1.x.x 필요.
• staging 배포(Render)는 이 PR과 무관 — 별도로 Render 대시보드 배포 트리거 branch를 dev→main으로 바꿔야 함(진행 중).

Test Plan

• YAML 문법 확인 (build CI 통과로 workflow 파일 자체는 파싱됨)
• 실제 태그 push로 상용 배포가 트리거되는지는 다음 릴리즈 때 확인 필요

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• .github/workflows/prod-cd.yml
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