PLANNER-2765 Expose the deployment template

[rsynek]

Updates a readme to reflect changes in https://github.com/kiegroup/optaplanner/pull/2225/.

JIRA

https://issues.redhat.com/browse/PLANNER-2765

Referenced pull requests

https://github.com/kiegroup/optaplanner/pull/2225 https://github.com/kiegroup/optaplanner-quickstarts/pull/420

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