compose: note that secrets require Linux containers#25541
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Description
Adds a NOTE callout to the Compose secrets guide stating that secrets are supported on Linux containers only, with the reason.
The page states secrets are delivered as a bind mount at
/run/secrets/<secret_name>, with no platform caveat. On Windows containers this fails at container creation:Windows containers can't bind-mount a single file, only directories — a platform limitation confirmed by maintainers in moby/moby#37120 and docker/cli#2055. Because Compose secrets are single-file bind mounts, they can't work on Windows containers.
Tested on a Windows Server 2025 container (
mcr.microsoft.com/windows/server:ltsc2025), Hyper-V isolation, Docker 29.6.1, Compose v2.Fixes #25540
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