fix: 운영 프론트 이미지 전달 복구

[Hyeonjun0527]

요약

• GitHub Actions job output으로 전달되던 frontend_image가 downstream deploy job에서 빈 값이 되어 운영 배포가 실패한 문제를 수정합니다.
• deploy job에서 이미지 전체 문자열을 output으로 받지 않고, 안전한 version/commit output으로 이미지 태그를 재구성합니다.
• 빈 이미지 값이면 서버 접속/컨테이너 제거 전에 즉시 실패하도록 가드를 추가했습니다.
• 새 이미지 pull 성공 이후에만 기존 컨테이너를 교체하도록 순서를 바꿔, 같은 문제가 재발해도 운영 컨테이너를 먼저 내리지 않게 했습니다.

검증

• ruby -e "require 'yaml'; YAML.load_file('.github/workflows/deploy-prod.yml'); puts 'yaml ok'"
• git diff --check
• node scripts/release/validate-release-record.mjs releases
• pre-push next build 통과

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Project	Deployment	Actions	Updated (UTC)
study-platform-client-dev	Building	Preview, Comment	May 17, 2026 6:26pm

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📥 Commits

Reviewing files that changed from the base of the PR and between d2efde0 and 113a97b.

📒 Files selected for processing (1)

• .github/workflows/deploy-prod.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/prod-frontend-image-output

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