add a wownero-android build script

etc/scripts/build-wownero.sh

@@ -0,0 +1,20 @@
+#!/usr/bin/env bash
+
+set -e
+
+version="aba46a"
+container="wownero-android-${version}"
+
+echo "Building: ${container}"
+echo
+
+cd ../vendor/wownero
+git fetch --all
+
+git checkout $version
+git submodule init && git submodule update
+
+docker build -f utils/build_scripts/android64.Dockerfile -t $container .
+docker create -it --name $container $container bash
+docker cp ${container}:/src/build/release/bin .
+