Several other AWS services like App Run and Lightsail Containers
appear to be layers atop Fargate, to the point that we cannot easily
tell them apart from within the container. Contacting the metadata
service would distinguish them, but doing that from inside tailscaled
seems uncalled for. Just report them as Fargate.
Signed-off-by: Denton Gentry <dgentry@tailscale.com>
Treat automated tests as their own, unique environment
rather than the type of container they are running in.
Signed-off-by: Denton Gentry <dgentry@tailscale.com>