Fix PR deployment workflow to use correct ref and event

[LiusCraft]

• Use pull_request.head.sha to checkout the actual PR code
• Change trigger from pull_request to pull_request_target for proper permissions

变更背景和解决方案

关联issue: #

文档更新（架构文档、API文档、升级文档）

Checklist

• 确认是否有文档更新
• 确认是否自测
• 确认是否考虑兼容升级，不兼容升级需要有对应的解决方案
• 确认是否考虑添加监控指标
• API 设计是否符合 API 设计规范, 如果没有 API 变更，请忽略
• 我已经添加了相关人员到 Reviewers 列表中
• 我已经设置了 Development 关联的 Issue

[niupilot]

PR Review in Progress

Reviewing PR #63 - GitHub Actions workflow deployment fixes

Todo List:

• Read and analyze the changed workflow file
• Compare changes against base branch (develop)
• Review security implications of pull_request_target trigger
• Evaluate pull_request.head.sha usage
• Check for workflow best practices compliance
• Provide comprehensive review feedback

[gemini-code-assist]

Note

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