CI: Improve instructions for finding and applying the patch generated by failed Github Actions (Version: 1.8.1)

[ximinez]

Issue Description

The instructions provided on failed jobs (example) don't clearly explain where to find the generated patch file. This can be a problem for anyone who is not familiar with how Github Actions pages are organized.

The general idea is:

From the details page, click on "Summary", then scroll down to the "Artifacts" section. There's a clang-format.patch/levelization.patch file there. Download it into your repo then run git apply [patchfile]. Commit and push.