How can I add a simple post-build action to Android Studio's Gradle?

With Eclipse, I had a post build event that zipped up the APK and the
map file from DexGuard. The resulting zip was more convenient to move
to my production server than having to move the two files individually.

How can I add this zip action to Android Studio’s Gradle?

Is there a simple way to do this without me getting into much Gradle programming?