How to get GitHub Actions workflow summary?

I need to get a workflow summary (i.e. the info I published using $GITHUB_STEP_SUMMARY) for specific RUN_ID in my workflow. I reviewed https://docs.github.com/en/rest, https://github.com/actions/github-script, GH CLI manual - but I still don't understand how to fetch this data.

Solution

The path to these job summaries is a bit convoluted...

First call the REST API for the runs of a job:

https://api.github.com/repos/{owner}/{repo}/actions/runs/{runid}/jobs

This will return a json payload:

{
  "total_count": 1,
  "jobs": [
    {
      "id": 13143160145,
      "run_id": 4850518271,
      "workflow_name": "test",
      "head_branch": "main",
      "run_url": "https://api.github.com/repos/{owner}/{repo}/actions/runs/4850518271",
      "run_attempt": 1,
      "node_id": "CR_kwDOJV3v7c8AAAADD2S1UQ",
      "head_sha": "db07f0a8a0eb2104583a4165c86d4da5603c8944",
      "url": "https://api.github.com/repos/{owner}/{repo}/actions/jobs/13143160145",
      "html_url": "https://github.com/{owner}/{repo}/actions/runs/4850518271/jobs/8643488313",
      "status": "completed",
      "conclusion": "success",
      "created_at": "2023-05-01T10:40:11Z",
      "started_at": "2023-05-01T10:40:18Z",
      "completed_at": "2023-05-01T10:40:20Z",
      "name": "build",
      "steps": [
...

Now grab the html_url and take that last ID off of it: https://github.com/{owner}/{repo}/actions/runs/4850518271/jobs/**8643488313**

and use that to fetch the summary_raw:

https://github.com/{owner}/{repo}/actions/runs/4850518271/jobs/8643488313/summary_raw

Which should return the raw markdown for the job summary.

I'm not 100% sure what that ID signifies as I can't find a reference to it elsewhere in the docs.