apt_upgrade: run the typical apt-get update + dist-upgrade + autoremove cycle

Signed-off-by: Alejandro Mery <amery@geeks.cl>

files/bin/apt_upgrade

@@ -0,0 +1,3 @@
+#!/bin/sh
+
+exec sudo sh -c 'apt-get update && apt-get dist-upgrade && apt-get autoremove --purge'