Release the RISC-V binary.

[come-maiz]

Part of #681.

📝 Summary

I've added risc-v to the goreleaser configuration.

⛱ Motivation and Context

This will enable the community to alpha test mev-boost in risc-v boards.

📚 References

---

✅ I have run these commands

• make lint
• make test-race
• go mod tidy

I build and ran the unit tests in a risc-v qemu.
With cloud-v we are setting up a jenkins project to build and test ethereum clients:
https://dash.cloud-v.co/view/all/job/github_app_come-maiz_165147473562/

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 41.51%. Comparing base (74a8ecb) to head (b56067a).
Report is 21 commits behind head on develop.

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Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #682      +/-   ##
===========================================
- Coverage    43.84%   41.51%   -2.33%     
===========================================
  Files           15       15              
  Lines         1608     1491     -117     
===========================================
- Hits           705      619      -86     
+ Misses         847      828      -19     
+ Partials        56       44      -12     

Flag	Coverage Δ
unittests	41.51% <ø> (-2.33%)	⬇️

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[jtraglia]

Oh exciting. LGTM 👍