Add basic release building script

bin/build_release.sh

@@ -0,0 +1,20 @@
+#!/bin/bash
+
+set -eu
+
+tmp=$(mktemp -d -t moonmmon)
+
+echo "[*] Building into $tmp..."
+
+cd "$tmp"
+git clone https://github.com/moonmoon/moonmoon.git --depth=1 --recursive -j8
+cd moonmoon
+composer install --no-suggest --prefer-dist --no-dev
+git describe --abbrev=0 --tags > VERSION
+find . -name .DS_Store -exec rm {} \;
+rm -rf .git .github .travis.yml .gitignore .gitmodules docs/.git/
+mkdir cache
+cd ..
+zip -r "moonmoon-$(cat moonmoon/VERSION).zip" .
+
+echo "[*] Grab the archive: ${tmp}/moonmoon-$(cat moonmoon/VERSION).zip"