RFR: 8287906: Rewrite of GitHub Actions (GHA) sanity tests [v4]

[Magnus Ihse Bursie]

On Fri, 10 Jun 2022 07:29:49 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

>> Magnus Ihse Bursie has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Apparently that was not a legal reference to actions/checkout. Try another way.
>
> This all looks very nice. I have a few inline comments.
> 
> The general one is that we need to make sure:
>  - jtreg needs to be built from its mainline at a given tag;
>  - tests need to pass (I assume you are waiting for test fixes to land first);

@shipilev JDK-8287902 and JDK-8287895 are now fixed, and with that, all msys2-related test problems should be resolved.

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PR: https://git.openjdk.org/jdk/pull/9063