Proposal to add my Review Apps+Nomad example

What does this MR do and why?

I created an example demonstrating how to enable the Review Apps feature with a HashiCorp Nomad cluster.

Maybe it's a good idea to make this example official after all required reviews.

MR acceptance checklist

• I have evaluated the MR acceptance checklist for this MR.
• Review the example.
• Move the repository to the GitLab-examples project
• Update the link