GitHub actions summary output fix

[erichiller]

This is a fix for #5640 to update the output format used by GitHub Actions.
Documentation here:

• https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/
• https://docs.github.com/en/actions/using-workflows/workflow-commands-for-github-actions#example-of-a-multiline-string

[adegeo]

Just nit picking on style 😁

I would think it would be better to do multiple write lines instead of a single with multiple lines, or use the interpolated string. This one is very clear as to the intent of the output:

textWriter.WriteLine("summary-details<<EOF");
textWriter.WriteLine(summary);
textWriter.WriteLine("EOF");

or this, which is less clear but a one-liner:

textWriter.WriteLine($"summary-details<<EOF\n{summary}\nEOF\n");

@IEvangelist ping

[erichiller]

Sure thing. Updated to use multiple testWriter.WriteLine. Let me know if there is anything else.