prefill should return a websocket that tracks progress

[todo]

woken/src/main/scala/ch/chuv/lren/woken/api/MaintenanceWebService.scala

Lines 57 to 60 in 916b9a4

	// TODO: prefill should return a websocket that tracks progress
	override def prefillMiningCache: Route = securePath(
	"maintenance" / "mining-cache" / "prefill",
	post {

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This issue was generated by todo based on a TODO comment in 916b9a4. It's been assigned to @ludovicc because they committed the code.