[jdk21u-dev] RFR: 8325194: GHA: Add macOS M1 testing [v4]

[Aleksey Shipilev]

On Mon, 12 Feb 2024 10:46:15 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 with a new target base due to a merge or a rebase. The pull request now contains three commits:
> 
>  - merge master
>  - Backport 3c91b59ef9c992718d73f2fc9fa50ad2ead78208
>  - Backport d1c82156ba6ede4b798ac15f935289cfcc99d1a0

Marked as reviewed by shade (Reviewer).

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PR Review: https://git.openjdk.org/jdk21u-dev/pull/238#pullrequestreview-1877588634