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

[George Adams]

On Fri, 16 Aug 2024 11:52:25 GMT, Magnus Ihse Bursie <ihse at openjdk.org> wrote:

> > 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.)

I'm not actually sure if line 39 is where we want to make the changes. I think we need to add some logic to this function to skip certain platforms by default when a push event is triggered:

https://github.com/openjdk/jdk/blob/c6906eff9db8f7e7737c42af49ae4f2f6ad7b095/.github/workflows/main.yml#L77-L112

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PR Comment: https://git.openjdk.org/jdk/pull/20577#issuecomment-2293726115