[错误]: CI 将 fork 的 pull_request 事件报告为 workflow 文件问题，但推送到 main 正常

Problem description

When PRs are submitted from the fork repository to the current repository, the CI (.GitHub/workflows/ci.yaml) triggered under the pull_request event reports "This run likely failed because of a workflow file issue", and the jobs are empty (no jobs are scheduled). However, the same workflow file can be successfully passed when pushed to the main branch.