Add riscv64 support

[ernado]

Add support for linux/riscv64.

Ref: #12244

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[ernado]

This is still relevant.

[github-actions]

We triage inactive PRs and issues in order to make it easier to find active work. If this issue should remain active or becomes active again, please add a comment.

This issue is labeled inactive because the last activity was over 90 days ago.