[section_request] Operator SDK examples

[geerlingguy]

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See the Ansible User Guide for the Operator SDK. (Looks like the docs link might be changing to https://sdk.operatorframework.io/docs/).

I would like to have a very basic Ansible-based Operator walkthrough (similar in style to how you generate a memcached operator using Operator SDK), and the hello-go app should be easy enough for this use case.

Later on I could make a hello-go-advanced app that deals with a database or some other persistent data, and has some sort of scheduled backup-to-S3 functionality, that sort of thing, and the operator could evolve into an 'advanced hello go operator' in a separate example.

I could also walk through how a more advanced Operator like one of the following is built:

• https://github.com/geerlingguy/mcrouter-operator
• https://github.com/geerlingguy/drupal-operator
• https://github.com/geerlingguy/mariadb-operator
• https://github.com/geerlingguy/tower-operator