RFR: 8282944: GHA: Add Alpine Linux x86_64 pre-integration check [v9]

[Magnus Ihse Bursie]

On Thu, 15 Aug 2024 15:58:19 GMT, George Adams <gdams at openjdk.org> wrote:

>> Adds Alpine build CI job to the GitHub actions matrix. Currently this only builds hotspot. I can add tests too if people think that would be useful but for now I've left it as just build.
>
> George Adams has updated the pull request incrementally with one additional commit since the last revision:
> 
>   build entire JDK rather than hotspot

> Tangentially, I think we should start thinking about extended workflows that are not run by default PR-triggers, so you could potentially run them if you wanted for Alpine-specific fixes. This would making the decisions like this rather easy.

I agree, we should really add that functionality. Then, as you say, it would be a no-brainer to add Alpine as an opt-in build and/or build+test.

If you are hesitant as well about adding this, maybe this is something we should prioritize before accepting this. (And then only accepting this as a non-default option.)

It might be so simple as to not list it in the `default` field of the platform selection part. 

@gdams Maybe you can test that? Revert line 39 in main.yml, and start the test manually and specify alpine as a target.

If that works fine, we can add some way for users to set their own defaults by setting a GHA environment/repository variable. (Either an "JDK_EXTRA_TARGETS" to just appent more to the default, or a "JDK_TARGETS" to completely override, or both.)

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PR Comment: https://git.openjdk.org/jdk/pull/20577#issuecomment-2293367690