RFR: 7903720: Change layout of jextract image [v5]

[Jorn Vernee]

On Tue, 30 Apr 2024 17:14:35 GMT, Jorn Vernee <jvernee at openjdk.org> wrote:

>> See JBS issue for problem description.
>> 
>> This patch changes the layout of the jextract image we produce. The new image has the 2 launcher scripts in the root of the image, with a nested `runtime` folder containing the jlink runtime image.
>> 
>> I've added both launcher scripts to the repo under the `src/main` directory, and they are copied to the image during the build. The script is somewhat simplified by removing a blank variable that was not being used. I also took the opportunity to address an issue with the windows launcher script turning off `echo`. Instead it now avoids output using the `@` prefix for each command in the script.
>> 
>> I've tested that the scripts work (using `jextract --help`) on both Linux and Windows.
>
> Jorn Vernee has updated the pull request incrementally with two additional commits since the last revision:
> 
>  - disable macos runs pt2
>  - disable macos runs

I've made a few more changes:

1. Implemented Maurizio's suggestion to allow passing options to the launcher through a shell variable
2. Set POSIX executable permissions for the copied script
3. Disable macos GHA runs. It looks like they switched their runner to arm64, so we can't use x64 llvm any more it seems.

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PR Comment: https://git.openjdk.org/jextract/pull/241#issuecomment-2086075763