feat: add ci with release builder and publisher

[LeoFVO]

Closes (#394)

Hey, I wanted to help the project to be adopted quickly, I think a vector of this is to allow user to install the tools easily.

I made some continuous integration and continuous deployment.
Actual CI/CD do:

• cross-platform code testing
• gem building
• publish gem on release on github registry + rubygem

This could allow user to use gem install whatweb or gem sources --add https://USERNAME:[email protected]/WhatWeb/.

You will need to get an API token from RubyGems and add it to your repository secrets.
The token is named: RUBYGEMS_AUTH_TOKEN

[LeoFVO]

It seems the action aren't triggered, I suggest to check in repository settings

https://docs.github.com/en/repositories/managing-your-repositorys-settings-and-features/enabling-features-for-your-repository/managing-github-actions-settings-for-a-repository#enabling-workflows-for-forks-of-private-repositories

[LeoFVO]

@urbanadventurer what do you think about this improvement ?

[Darkrevengehack]

@urbanadventurer