Remove most obsolete files before migrating to maestro

images/firefox/build/scripts/99_cleanup.sh

@@ -0,0 +1,10 @@
+#!/bin/bash
+set -e
+source /build/config
+set -x
+
+apt-get clean
+#rm -rf /build
+rm -rf /tmp/* /var/tmp/*
+rm -rf /var/lib/apt/lists/*
+rm -f /etc/dpkg/dpkg.cfg.d/02apt-speedup