RFR: 8283929: GHA: Add RISC-V build config [v3]

[Aleksey Shipilev]

On Tue, 6 Sep 2022 13:27:01 GMT, Ludovic Henry <luhenry at openjdk.org> wrote:

>> It adds CI for cross-compiling to linux-riscv64. It requires to use Ubuntu repositories for the debootstrap image because Debian doesn't have riscv64 packages on https://httpredir.debian.org/debian/. We can follow up on this change with switching to http://ports.ubuntu.com/ubuntu-ports for all cross-compiled architectures.
>> 
>> This change also does not require nor blocks switching to Ubuntu 22.04.
>> 
>> From talking with @shipilev, this replaces https://github.com/openjdk/jdk/pull/10086.
>
> Ludovic Henry has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Use Debian ports repository for riscv64

Looks good to me, thanks.

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Marked as reviewed by shade (Reviewer).

PR: https://git.openjdk.org/jdk/pull/10168