Support GitHub Actions output

[paulz]

It would nice to have xcpretty formatter that supports GitHub Actions warnings and errors.

Similar to travis formatter: https://github.com/kattrali/xcpretty-travis-formatter

Currently when xcodebuild fails on GitHub action with xcpretty default formatter we get:

Annotations

 Check failure on line 1 in .github

 @github-actions
github-actions
/ build-and-test

.github#L1
Xcodebuild action failed (65)!
 Check failure on line 1 in .github

 @github-actions
github-actions
/ build-and-test

.github#L1
Xcodebuild action failed (65)!

which incorrectly reports failures on line 1 of the workflow file.

See example:
https://github.com/sparta-science/MacSwitchActivation/actions/runs/141734946

It would be very helpful to see failure file and line number, such as

UITests.swift:54

https://github.com/sparta-science/MacSwitchActivation/runs/790560979?check_suite_focus=true#step:4:38

GitHub Actions support setting errors and warnings:
https://help.github.com/en/actions/reference/workflow-commands-for-github-actions#setting-an-error-message

[samshiffman321]

I'm also having issues with xcpretty and github actions, I'm getting test failures but the pipeline still passes. is this going to be fixed any time soon?

[Justintime50]

@samshiffman321 I think what you are reporting is slightly different than what the author of this issue is asking about. I've filed another issue for what you are seeing as I too have the same problem: #386