[bug] Alert the user if docker is not running when creating or starting a sandbox cluster

[digiserg]

When I try to create a sandbox on a desktop where docker has not been installed I get alerted. But if docker is installed but not running (default in windows it seems) I get unexpected error instead.

We should alert the end user if the docker server/daemon is not running.

Not - only do this as a pre-check to invoking the docker commands. It is not necessary to have docker running to use the app in BAU fashion.

[mhmdkrmabd]

Working on that

[mhmdkrmabd]

@digiserg so on all OSes if docker is not installed or missing the user will get an error feedback:

On Linux and macOS the up/down commands won't work if docker-demon is not running: Is this error feedback missing on Windows?

[mhmdkrmabd]