I'm trying to setup a VM using Multipass, and I want to select the "docker" image instead of the default.

I've seen the documentation at <https://multipass.run/docs/launch-command>, which at the bottom has:

```
image                Optional image to launch. If omitted, then the default
                     Ubuntu LTS will be used.
                     <remote> can be either ‘release’ or ‘daily‘. If <remote>
                     is omitted, ‘release’ will be used.
                     <image> can be a partial image hash or an Ubuntu release
                     version, codename or alias.
                     <url> is a custom image URL that is in http://, https://,
                     or file:// format.

```

But I don't know what syntax I'm supposed to use to select an image.

`$ multipass launch --image docker` gives `Unknown option 'image'.`

`$ multipass launch image docker` gives `Too many arguments supplied`.

`$ multipass launch image=docker` gives `launch failed: Remote "" is unknown or unreachable.`

How do I create a VM with a different image than the default?