RFR: 8282944: GHA: Add Alpine Linux x86_64 pre-integration check [v3]

[George Adams]

On Thu, 10 Mar 2022 22:51:44 GMT, Magnus Ihse Bursie <ihse at openjdk.org> wrote:

> I was not very fond of adding x86 testing to GHA either. :-) I will not enter the fight if that should be removed. (But my personal opinion is that it makes a whole lot more sense to test on a 32-bit architecture than just a different libc.)
> 
> If you can change this to just test hotspot, it'd definitely be an improvement. Building hotspot requires just a fraction of the resources needed to build the entire JDK.

@magicus I've refactored this PR and switched it to testing hotspot only: https://github.com/openjdk/jdk/pull/20577

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PR Comment: https://git.openjdk.org/jdk/pull/7771#issuecomment-2288382745