While inside a container, how can I tell if I'm running on OrbStack?

[Luc45]

If I'm running on a Mac, and it's not OrbStack, I want to display a message pointing them to OrbStack, eg:

if [ "$(uname)" == "Darwin" ]; then
    docker run --rm alpine sh -c \
    'if [ -z "$SOME_ORBSTACK_ENV" ]; then 
        echo "Get up to 2x faster test runs by switching from Docker Desktop to OrbStack. Read more: https://mydocs.com"; 
     fi'
fi

Is there an env var like $SOME_ORBSTACK_ENV that I can run either on host, or preferably inside the container to detect OrbStack?

[kdrag0n]

Inside container: uname -r should contain orbstack.

[Luc45]

Thanks!