Pull request info missing from repos/OWNER/REPO/actions/runs (when run was trigger by a PR)

[bric3]

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Bug

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The REST API to get GHA runs does not fill in pull_requests when a run was triggered by a pull request, i.e. the array is empty.

# curl -L
#  -H "Accept: application/vnd.github+json"
#  -H "Authorization: Bearer <YOUR-TOKEN>"
#  -H "X-GitHub-Api-Version: 2022-11-28"
#  https://api.github.com/repos/OWNER/REPO/actions/runs

GET https://api.github.com/repos/bric3/jufmt/actions/runs
Accept: application/vnd.github+json
Authorization: Bearer <token>
X-GitHub-Api-Version: 2022-11-28

E.g. this run triggered by a a pull request

• https://github.com/bric3/jufmt/actions/runs/6223317359

The returned payload for the corresponding run (242) below, you can notice the fields "event": "pull_request" and that "pull_requests": [] is empty.

    {
      "id": 6223317359,
      "name": "Java CI with Gradle",
      "node_id": "WFR_kwLOEufiyM8AAAABcvBJbw",
      "head_branch": "windows-failure",
      "head_sha": "0a1e93ee775f4311bf61aa78171890c1937c7c6d",
      "path": ".github/workflows/gradle.yml",
      "display_title": "Understand windows failure",
      "run_number": 242,
      "event": "pull_request",
      "status": "completed",
      "conclusion": "success",
      "workflow_id": 20103782,
      "check_suite_id": 16285471685,
      "check_suite_node_id": "CS_kwDOEufiyM8AAAADyrCTxQ",
      "url": "https://api.github.com/repos/bric3/jufmt/actions/runs/6223317359",
      "html_url": "https://github.com/bric3/jufmt/actions/runs/6223317359",
      "pull_requests": [],
      "created_at": "2023-09-18T13:35:21Z",
      "updated_at": "2023-09-18T13:42:56Z",
      ...

I believe this is a bug in the API.