deploy-model target no longer works for versions 8.2.11 and above

[upgradingdave]

zbctl cli was removed from the camunda/zeebe image as of 8.2.11. So, make deploy-model no longer works

[upgradingdave]

Updated the zbctl-deploy-job.yaml to use a custom image called upgradingdave/zbctl, see 8fada04. It works, but it's not ideal. There are a few tasks to do before closing this issue:

1. Determine if there's an official zbctl image that will be maintained, and, if so, use that instead
2. Add the ability to deploy models when zeebe-gateway is protected by oauth