Add preliminary build script

This depends on the flarum/core dependency moving back to composer.json

build.sh

@@ -0,0 +1,27 @@
+#!/usr/bin/env bash
+
+rm -rf /tmp/flarum-release
+mkdir /tmp/flarum-release
+
+git archive --format zip HEAD > /tmp/flarum-release/release.zip
+
+cd /tmp/flarum-release
+unzip release.zip -d ./
+rm release.zip
+
+# Install all Composer dependencies
+cd /tmp/flarum-release/system
+composer install --prefer-dist --optimize-autoloader --ignore-platform-reqs --no-dev
+
+# Install frontend dependencies
+cd /tmp/flarum-release/system/vendor/flarum/core/js
+bower install
+
+cd /tmp/flarum-release/system/vendor/flarum/core/js/forum
+npm install
+gulp
+
+cd /tmp/flarum-release/system/vendor/flarum/core/js/admin
+npm install
+gulp
+