RFR: 8284389: Improve stability of GHA Pre-submit testing by caching cygwin installer [v2]

[Christoph Langer]

On Wed, 6 Apr 2022 11:12:39 GMT, Christoph Langer <clanger at openjdk.org> wrote:

>> Make cygwin usage in GHA more reliable
>> 
>> With this change we now attempt to retrieve the cygwin installer from cache every time we need it.
>> We would also only try to download it once per build job, in the beginning.
>> During testing we rely on it being cached which will make potential errors more obvious
>> (e.g. in the download step in the beginning of the build).
>> 
>> I also replaced actions/cache at v2 with v3. Didn't see issues.
>
> Christoph Langer has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Implement review suggestions by @shipilev

Thanks for the review.

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PR: https://git.openjdk.java.net/jdk/pull/8113