RFR: add simple test workflow [v2]

[Igor Ignatyev]

On Fri, 9 Jul 2021 23:22:44 GMT, Jonathan Gibbons <jjg at openjdk.org> wrote:

>> 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
>
> Changes requested by jjg (Lead).

@jonathan-gibbons , I've updated the workflow to use `make/build.sh` and also noticed that I used `JDK8_HOME` when it should have been `JDK8HOME`

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