Fix "Unknown server OS" for Docker container --device option (#1957)

The `--device` option would do platform-dependent validation, but the
OS was not passed as an argument. When a user added the `--device` option
to the container, it would result in a "Unknown server OS" error.

pkg/container/docker_run.go

@@ -351,7 +351,7 @@ func (cr *containerReference) mergeContainerConfigs(ctx context.Context, config
 		}
 	}
 
-	containerConfig, err := parse(flags, copts, "")
+	containerConfig, err := parse(flags, copts, runtime.GOOS)
 	if err != nil {
 		return nil, nil, fmt.Errorf("Cannot process container options: '%s': '%w'", input.Options, err)
 	}