Merge "zypper: Clean caches and don't cache packages locally"

diskimage_builder/elements/zypper/post-install.d/98-zypper-clean-cache

@@ -0,0 +1,10 @@
+#!/bin/bash
+
+if [ ${DIB_DEBUG_TRACE:-0} -gt 0 ]; then
+    set -x
+fi
+set -eu
+set -o pipefail
+
+# clean all locally cached metadata
+sudo zypper clean -a