Add support for configuring DigitalOcean agents #812

Job	Run time
kitchen / prepare-matrix	2s
kitchen / run-kitchen-tests (fedora-40)	1m 57s
kitchen / run-kitchen-tests (centos-stream-9)	2m 13s
kitchen / run-kitchen-tests (centos-stream-10)	2m 11s
kitchen / run-kitchen-tests (ubuntu-2204)	2m 0s
kitchen / run-kitchen-tests (debian-12)	1m 36s
kitchen / run-kitchen-tests (ubuntu-2404)	2m 29s
	12m 28s

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