Make `alerts` a list and use a `for_each`. #93

Job	Run time
docs (authorize-private-service)	13s
docs (cloudevent-broker)	8s
docs (cloudevent-trigger)	6s
docs (cloudevent-recorder)	6s
docs (networking)	4s
docs (dashboard/service)	7s
docs (dashboard/job)	6s
docs (dashboard/cloudevent-receiver)	8s
	58s

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