[PROOF OF CONCEPT] Playwright report in pr

[EvidentlyCube]

This is a draft PR to attempt to add posting playwright build reports into the PR.

References:

• Add support for running in-browser tests via playwright in GitHub CLI #7820
• Intentionally throw an error when running tests in the browser #7823

It's not posted as a draft to make sure all actions run. I'll be actively working on this so feel free to ignore this PR until I remove [PROOF OF CONCEPT] from the title.

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Name	Status	Preview	Updated (UTC)
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[Jermolene]

Thank you @EvidentlyCube good luck with this, much appreciated.

[EvidentlyCube]

I am closing this PR. I was unable to make it work and ran out of ideas to try so I won't be able to put anymore work into this.

[Jermolene]

Thanks for all your work @EvidentlyCube, much appreciated. Hopefully your commits in this PR might help someone in the future.

[EvidentlyCube]

The main obstacle I've encountered is that it appears that there are two contexts in which github actions run in response to pull requests. One is on.pull_request which, simplifying, runs in the context of the fork and on.pull_request_target which runs in the context of the target repository. The former context doesn't allow posting comments in PR and the latter context is somehow protected - the jobs wouldn't run when a new commit was pushed into the PR branch.

There must be some trick to get it all working because it feels like something doable but no luck for me :).

[Jermolene]

Thank you @EvidentlyCube that is interesting. It appears that Vercel (and presumably other CI integrations) do manage to do the same thing, so it must be possible.