RFR: add simple test workflow [v2]

[Jonathan Gibbons]

On Fri, 9 Jul 2021 23:36:31 GMT, Igor Ignatyev <iignatyev at openjdk.org> wrote:

>> Hi all,
>> 
>> could you please review this small patch that adds a simple github action workflow to build and test `jtreg` on `linux-x64`?
>> 
>> Thanks,
>> -- Igor
>
> Igor Ignatyev has updated the pull request incrementally with two additional commits since the last revision:
> 
>  - use bash instead of sh to run make/build.sh
>  - use make/build.sh
>    s/JDK8_HOME/JDK8HOME

Thanks for looking at this.

Looks generally OK; I'm not an expert on GitHub Actions, but it seems to satisfy the initial criteria of "do no harm" ;-)

Are other versions of JDK available for GitHub Actions?  Some of the tests are specific to versions of JDK ... and are guarded by `ifdef JDK`_N_`HOME` for a variety of values of _N_

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Marked as reviewed by jjg (Lead).

PR: https://git.openjdk.java.net/jtreg/pull/16