[crac] RFR: Disable non-buildable platforms in GHA

[Dan Heidinga]

On Tue, 12 Apr 2022 06:56:31 GMT, Anton Kozlov <akozlov at openjdk.org> wrote:

> Disable builds on GitHub Actions for platforms that is not expected to build successfully. The change removes GHA failures noise in forks of the project repo. https://github.com/AntonKozlov/crac/actions/runs/2109490740
> 
> I've also requested GHA to be enabled to the project repo, so tests report should appear for this PR.

I'm not a github actions expert but this seems like a reasonable approach to disable the unneeded platforms.  And it's not worse than what we have now - so go for it!

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Marked as reviewed by heidinga (Committer).

PR: https://git.openjdk.java.net/crac/pull/20