[RISC-V]init RISC-V ci

[XYenChi]

1.Cross build and test with qemu
2.Set RVVM1 as default

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[luhenry]

Similar work was done initially in #477

[XYenChi]

Ok, I close the pr.

[luhenry]

Sorry, I didn’t mean that it should be closed. The CI testing was removed in subsequent commits. Feel free to try to get it added again, I do believe it’s important for the OSS community as a whole!

[XYenChi]

Thank you for information, and I reopened the pr. XD