`fleetctl preview` fails to use `docker compose`

[roperzh]

Fleet version: 4.54

Web browser and operating system:

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💥  Actual behavior

if docker-compose is not installed, fleetctl preview fails with:

Error: `docker compose` is required for the fleetctl preview experience.

Please install `docker compose` (https://docs.docker.com/compose/install/).

🧑‍💻  Steps to reproduce

1. In a machine with Docker installed but without the deprecated docker-compose, try to run fleetctl preview

1 might be too much trouble to repro and we can rely on the workers which are currently failing:

https://github.com/fleetdm/fleet/actions/runs/10219989323/job/28279424468?pr=21004

if the PR fixes the worker it might be enough to call it

🕯️ More info (optional)

fleetctl is performing the check, but seems like the command is wrong:

fleet/cmd/fleetctl/preview.go

Lines 77 to 79 in 86eaadf

	if err := exec.Command("docker", "compose").Run(); err == nil {
	return dockerCompose{dockerComposeV2}, nil
	}

[fleet-release]

"Docker compose" missed,
Fleetctl preview adapts,
Flows like cloud city's mist.