Use the Drupal Operator for Kubernetes instead of custom templates

[geerlingguy]

It might make things easier to manage...

See: https://github.com/geerlingguy/drupal-operator

Though I would want to be able to use the drupal-for-kubernetes image (and the geerlingguy/drupal image) with this instead of the Docker library Drupal image.

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[geerlingguy]

Good thing I didn't work on this until now; the Operator SDK didn't support ARM64 until recently: operator-framework/operator-sdk#2742