coqbot minimizer should upload and attach the file to GH when it's truncated
We can probably use https://github.com/actions/upload-artifact/issues/50 / https://docs.github.com/en/free-pro-team@latest/rest/reference/actions#download-an-artifact to get a link to the uploaded artifact(s) from the GH Actions job, and include the URL in the data we send to the bot.
The bug minimizer runner will now include links directly to the artifacts like
<details><summary>Build Log (contains the Coq error message) (truncated to last 8.0KiB; full 12KiB file on <a href="https://github.com/coq-community/run-coq-bug-minimizer/actions/runs/7493577714">GitHub Actions Artifacts</a> under <a href="https://github.com/coq-community/run-coq-bug-minimizer/actions/runs/7493577714/artifacts/1163423296" api-href="https://api.github.com/repos/coq-community/run-coq-bug-minimizer/actions/artifacts/1163423296/zip"><code>build.log</code></a>)</summary>
So now I think it's up to the bot to look at the comment html for any a tags with api-href, download the artifact, upload it to the repo GitHub, and link to it in the comment. I guess the minimizer runner could plausibly do its own upload on its own repo, to persist the data past when logs expire, using https://github.com/j178/github-s3 ? see also https://github.com/coq/coq.github.io/issues/234#issuecomment-1761083288