[installer]: containerd runtime dir validation doesn't error

[mrsimonemms]

Bug description

If the containerd runtime dir is invalid, it doesn't actually error. It returns:

Field 'Config.Workspace.Runtime.ContainerDRuntimeDir' must start with '/'{
  "valid": true
}

The exit code is also 0

Check if this is in this one section or (more likely) a mistake in the whole config validation

Steps to reproduce

Remove the / at the start of workspace.runtime.containerdRuntimeDir and run installer validate config -c config.yaml

Workspace affected

No response

Expected behavior

No response

Example repository

No response

Anything else?

No response