Add the sha256 digest to the deployment image reference (#1673) #2017

Job	Run time
typecheck / typecheck	3m 24s
units / 🧪 Unit Tests	2m 4s
publish-webapp / publish	2m 45s
publish-worker / build (coordinator)	1m 54s
publish-worker / build (docker-provider)	52s
publish-worker / build (kubernetes-provider)	41s
	11m 40s

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