CI based CNAME verfication

[littledivy]

Describe change
Every PR will have to pass the verfication CI inorder to get mergable status.

Additional context
Avoids manual verfication. Happy to create a PR 😄

[notfilippo]

Awesome idea 💡 , but we need to make sure that the the request process remains seamless. We should also keep in mind that we need to provide support not only to GH Pages but also Vercel, Netlify and others...