RFR: 8256127: Add cross-compiled foreign architectures builds to submit workflow [v6]

[Aleksey Shipilev]

On Fri, 13 Nov 2020 11:04:38 GMT, Robin Westberg <rwestberg at openjdk.org> wrote:

>>> Looks good! I did a similar attempt at cross building a while ago, but never got around to finishing it, so it's nice to see it materializing! I do have a general comment on reducing the amount of duplicated content though. Since all these cross-build platforms share the same prerequisites, they can be expressed as matrix builds. Here's what I did: https://github.com/rwestberg/jdk/blob/947c934621c3013c055152356615e0120382cedf/.github/workflows/submit.yml#L102
>> 
>> Right. AFAIU your code, it bootstraps the chroot and builds x86_64 build JDK for every config and every run, something this PR is able to avoid. We'd need to figure that out. I think that is pretty doable, but it would require a few days worth of pipeline testing to work out the kinks. So, would you mind we do that in the follow-ups?
>
> Yeah, it would certainly need a bit of adaptation to capture the differences properly, so perfectly fine to look into later!

Thanks folks! I'll merge the master and see if it is still green, and if it is, I'll integrate.

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PR: https://git.openjdk.java.net/jdk/pull/1147