[jdk21u-dev] RFR: 8325194: GHA: Add macOS M1 testing [v2]

[Aleksey Shipilev]

On Tue, 6 Feb 2024 15:53:13 GMT, George Adams <gdams at openjdk.org> wrote:

>> Now that macOS M1 executors are [available in GitHub actions](https://github.blog/changelog/2024-01-30-github-actions-introducing-the-new-m1-macos-runner-available-to-open-source/) it makes sense to move the build to run on M1 (rather than cross-compiled) and also enable testing on the platform.
>
> George Adams has updated the pull request incrementally with one additional commit since the last revision:
> 
>   work around realpath not working

We really need to figure out what is missing in JDK repos for this, instead of diverging. We are waiting for https://bugs.openjdk.org/browse/JDK-8324723 to land first to get the msys2 update...

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PR Comment: https://git.openjdk.org/jdk21u-dev/pull/238#issuecomment-1930139327