Add github summary support

[melg8]

It would be great to not just have comments in pull request, but also github summary report for users, which are working on some branch but don't use pull requests. As bonus it's easier to navigate inside summary to artifacts, rather than by clicking in element of table in pull request message, than going to another page => artifacts -> scroll down -> find yours artifact. This workflow happened to be not intuitive for some of new users.

Original feature presented by github in blog post

[echoix]

That seems quite a nice and useful output, and I think it's easily implementable, since there is already a markdown comment output.

That blog post shows some really clean results, I like this!

[Kurt-von-Laven]

Yeah, this seems great. Happy to accept a pull request for this.

[nvuillam]

It woud indeed be nice :)
This could be done either in a brand new GithubSummaryReporter.py class :)

[github-actions]

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[echoix]

I still have it in my long term goals.

[github-actions]

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