Support risc-v

[come-maiz]

RISC-V is a good start to get Ethereum nodes running in free hardware, which is a necessary step for a local-first decentralized economy.

Let's support the risc-v architecture in this project. This way we will explore some of the possible problems, and it will be easier for others to follow.

[come-maiz]

The build and tests are now running in the cloud-v jenkins:

https://dash.cloud-v.co/blue/organizations/jenkins/github_app_come-maiz_134336265170/detail/PR-3/1/pipeline