[Fix] workflow(owner-notification): fix workflow error

[samzong]

FILL IN THE PR DESCRIPTION HERE

FIX #754 (link existing issues this PR will resolve)

owner-notification often go wrong, I think we can switch to use pulls.listFiles via github-script for get Changed Files.

• Fork-safe: no refs/heads/<head_ref> lookups, so fork PRs stop 404’ing.
• Safer on pull_request_target: we don’t fetch/run forked code.
• Simpler and steadier: one API call, fewer knobs; uses GitHub’s own file list, so it ignores branch deletions/force-pushes.
• Faster and cleaner logs: no extra fetch/diff work.

I create an test script working on my local, It's worked.

~/git/semantic-router (fix/owner-notification-error-2) node local_owner_notification.js .github/workflows/owner-notification.yml
Changed files: [ '.github/workflows/owner-notification.yml' ]
Assignees: [ 'rootfs', 'Xunzhuo' ]
Comment Preview:

## 👥 vLLM Semantic Team Notification

The following members have been identified for the changed files in this PR and have been automatically assigned:

### 📁 `Root Directory`
**Owners:** @rootfs, @Xunzhuo
**Files changed:**
- `.github/workflows/owner-notification.yml`

---
<div align="center">
<img src="https://raw.githubusercontent.com/vllm-project/semantic-router/main/website/static/img/repo.png" alt="vLLM" width="80%"/></div>

## 🎉 Thanks for your contributions!

*This comment was automatically generated based on the OWNER files in the repository.*

If u want know more about this script.

View local_owner_notification.js

const fs = require('fs');
const path = require('path');
const cp = require('child_process');

function getChangedFiles() {
  const args = process.argv.slice(2);
  if (args.length > 0) return args;
  try {
    const out = cp.execSync('git diff --name-only HEAD --', { encoding: 'utf8' }).trim();
    if (out) return out.split('\n').filter(Boolean);
  } catch (_) {}
  try {
    const out = cp.execSync('git ls-files -m', { encoding: 'utf8' }).trim();
    if (out) return out.split('\n').filter(Boolean);
  } catch (_) {}
  return [];
}

function findOwnerFile(filePath) {
  const parts = filePath.split('/');
  if (parts.length > 1) {
    const firstLevelDir = parts[0];
    const ownerPath = path.join(firstLevelDir, 'OWNER');
    if (fs.existsSync(ownerPath)) {
      const content = fs.readFileSync(ownerPath, 'utf8');
      const owners = content.split('\n').filter(line => line.trim().startsWith('@')).map(line => line.trim());
      if (owners.length > 0) return { path: firstLevelDir, owners };
    }
  }
  if (fs.existsSync('OWNER')) {
    const content = fs.readFileSync('OWNER', 'utf8');
    const owners = content.split('\n').filter(line => line.trim().startsWith('@')).map(line => line.trim());
    if (owners.length > 0) return { path: '.', owners };
  }
  return null;
}

function buildOwnerMap(changedFiles) {
  const ownerMap = new Map();
  for (const file of changedFiles) {
    if (!file.trim()) continue;
    const info = findOwnerFile(file);
    if (!info) continue;
    if (!ownerMap.has(info.path)) ownerMap.set(info.path, { owners: info.owners, files: [] });
    ownerMap.get(info.path).files.push(file);
  }
  return ownerMap;
}

function buildAssignees(ownerMap) {
  const all = new Set();
  for (const [, info] of ownerMap) for (const owner of info.owners) all.add(owner.replace('@', ''));
  return Array.from(all);
}

function buildComment(ownerMap) {
  let body = '## 👥 vLLM Semantic Team Notification\n\n';
  body += 'The following members have been identified for the changed files in this PR and have been automatically assigned:\n\n';
  for (const [dirPath, info] of ownerMap) {
    body += `### 📁 \`${dirPath === '.' ? 'Root Directory' : dirPath}\`\n`;
    body += `**Owners:** ${info.owners.join(', ')}\n`;
    body += `**Files changed:**\n`;
    for (const f of info.files) body += `- \`${f}\`\n`;
    body += '\n';
  }
  body += '---\n';
  body += '<div align="center">\n';
  body += '<img src="https://raw.githubusercontent.com/vllm-project/semantic-router/main/website/static/img/repo.png" alt="vLLM" width="80%"/>';
  body += '</div>\n\n';
  body += '## 🎉 Thanks for your contributions!\n\n';
  body += '*This comment was automatically generated based on the OWNER files in the repository.*';
  return body;
}

function main() {
  const changed = getChangedFiles();
  console.log('Changed files:', changed);
  const ownerMap = buildOwnerMap(changed);
  if (ownerMap.size === 0) {
    console.log('No owners found for changed files');
    process.exit(0);
  }
  const assignees = buildAssignees(ownerMap);
  console.log('Assignees:', assignees);
  const comment = buildComment(ownerMap);
  console.log('Comment Preview:\n');
  console.log(comment);
}

main();

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[samzong]

@Xunzhuo @rootfs It's PR want fix Owner Notification workflow error.

and i sync this workflow to another repo, It's already work.

• action log: https://github.com/DaoCloud/DaoCloud-docs/actions/runs/19852126659/job/56881106321?pr=6886#step:3:1
• commit msg: Update insight grafana docs DaoCloud/DaoCloud-docs#6886 (comment)