fleetctl: Add command to show id #289

Job	Run time
lint / lint	1m 25s
unit-tests / unit-tests	2m 1s
validate / build	15s
build-manifests / build	11s
build-fleetlock / build-and-push-image	3m 5s
build-fleetctl (amd64) / build	12s
build-fleetctl (arm64) / build	17s
	7m 26s

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