Heroku CI Support

[HiroAgustin]

After turning on Heroku CI, when trying to run tests the following error message shows up:

TEST SETUP ERRORED

-----> Reading manifest...
-----> Fetching https://github.com/mars/create-react-app-buildpack.git buildpack...
       buildpack downloaded
 !     Unable to detect any runnable tests.
 !     For more information on how to resolve the issue, please see:
 !     https://devcenter.heroku.com/articles/heroku-ci-prerelease

Notice I'm using Heroku Pipelines for automated deployments and I have ejected my create-react-app project.

Its worth mentioning that running npm test locally does run the test suite correctly.

[mars]

Thanks for opening this issue. I've been meaning to add Testpack API support to this buildpack.

I'll address this soon and follow up here.

[HiroAgustin]

Thank you for the quick response. Please let me know if there's anything I can do to help.
Thanks for the GREAT repo btw.

[mars]

🏁 Done. Please, follow-up here if you experience any issues.

[mars]

📚 Docs added to README

[HiroAgustin]

Forgot to thank you for the CI Support, working like a charm. Really appreciate it, thanks!