Add support for configuring DigitalOcean agents #813

Job	Run time
kitchen / prepare-matrix	3s
kitchen / run-kitchen-tests (centos-stream-9)	2m 35s
kitchen / run-kitchen-tests (centos-stream-10)	2m 1s
kitchen / run-kitchen-tests (fedora-40)	1m 52s
kitchen / run-kitchen-tests (ubuntu-2204)	1m 55s
kitchen / run-kitchen-tests (ubuntu-2404)	2m 14s
kitchen / run-kitchen-tests (debian-12)	1m 57s
	12m 37s

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