My personal wish is for the ability to attach HTML reports the the action runs without having to use the current actions/upload-artifact etc.

Particularly for test builds, I very often just want to quickly view the output HTML report. The current approaches I am familiar with are the aforementioned upload-artifact, or using GH pages, but GH pages is not great when you have multiple different reporting output for the same repo, or you wanna quickly view historical reporting rather than latest.

I'd love a simple "attach-report" action that just put a link to an HTML report on the job summary, and clicking on it renders the html.

Other automated CI/CD style systems have much richer support out of the box for dealing with HTML report capturing and viewing.