Allow setting the platform of the image to download (#15)

utils/utils.go

@@ -11,6 +11,7 @@ import (
 	"os"
 	"os/exec"
 	"os/signal"
+	"runtime"
 	"strings"
 
 	"github.com/denisbrodbeck/machineid"
@@ -246,3 +247,8 @@ func GetInterfaceIP(in string) string {
 	}
 	return ""
 }
+
+// GetCurrentPlatform returns the current platform in docker style `linux/amd64` for use with image utils
+func GetCurrentPlatform() string {
+	return fmt.Sprintf("%s/%s", runtime.GOOS, runtime.GOARCH)
+}