add RISC-V build

[light4]

add RISC-V build

[light4]

Can someone please approve the running workflows? My network is too laggy.

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[avindra]

I think you may have to update the fn platform() -> String function to set arch to the needed value (riscv64).

[light4]

Since this PR needs some changes on upstream, and I don't want to tackle on other platform except GitHub, so I'll just close this.

[aapoalas]

Since this PR needs some changes on upstream, and I don't want to tackle on other platform except GitHub, so I'll just close this.

Which upstream repo specifically?

[light4]

You can check the error here:
https://github.com/denoland/rusty_v8/actions/runs/3884230009/jobs/6626676363?pr=1168

Related code:
https://github.com/denoland/chromium_build/blob/cf1eb294256dd95a6273cdcf737e8b114a81ad40/linux/sysroot_scripts/install-sysroot.py