specs-go/config: Use a pointer for Process.ConsoleSize

Avoid injecting:

  "consoleSize":{"height":0,"width":0}

when serializing with Go's stock JSON serializer. Using a pointer for
this optional struct property works around [1].

[1]: golang/go#11939

Signed-off-by: W. Trevor King <wking@tremily.us>

Author: wking

specs-go/config.go

@@ -34,7 +34,7 @@ type Process struct {
 	// Terminal creates an interactive terminal for the container.
 	Terminal bool `json:"terminal,omitempty"`
 	// ConsoleSize specifies the size of the console.
-	ConsoleSize Box `json:"consoleSize,omitempty"`
+	ConsoleSize *Box `json:"consoleSize,omitempty"`
 	// User specifies user information for the process.
 	User User `json:"user"`
 	// Args specifies the binary and arguments for the application to execute.