Integrate with GitHub job summaries

[OliverRC]

Not entirely sure how to have both STD OUT and Job Summary integration right now but might be cool to allow it as an option.
Supercharging GitHub Actions with Job Summaries | The GitHub Blog

[OliverRC]

Can write to / append to the ENV var by the looks of things:
https://learn.microsoft.com/en-us/dotnet/api/system.environment.setenvironmentvariable?view=net-6.0