RFR: 8253424: Add support for running pre-submit testing using GitHub Actions

[Andrew John Hughes]

On Mon, 25 Apr 2022 18:38:58 GMT, Erik Joelsson <erikj at openjdk.org> wrote:

> The .jcheck/conf file is still broken in this repo. Please run `git jcheck` in locally in the repo to see the exception.

I have. I've fixed it locally and in this PR, but `jcheck` only picks it up when it's applied to the `master` branch. I guess I'll have to do another direct push with it. I'm waiting on ops to add `shenandoah8u332` to the list of JBS versions.

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PR: https://git.openjdk.java.net/shenandoah-jdk8u/pull/3