RFR: 7903857: apidiff: Include test run in GitHub Actions workflow [v4]

[Pavel Rappo]

On Wed, 2 Oct 2024 09:41:24 GMT, Christian Stein <cstein at openjdk.org> wrote:

>> Please review this change to actually run ApiDiff's self-tests on all three major platforms.
>
> Christian Stein has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Try other MSYS2 installation path

How did you verify that the updated workflow works?

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PR Comment: https://git.openjdk.org/apidiff/pull/23#issuecomment-2388390663