add busybox to coordinator image #2050

Job	Run time
units / 🧪 Unit Tests	2m 16s
typecheck / typecheck	3m 29s
publish-webapp / publish	2m 53s
publish-worker / build (coordinator)	1m 38s
publish-worker / build (docker-provider)	58s
publish-worker / build (kubernetes-provider)	53s
	12m 7s

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