Build modified streamline images

The official image from streamline does not currently work for the arm64
platform. As a temporary measure, the source code and docker build scripts
have been lifted from the official images and are used to build locally.

Some additional modifications are made to reduce overall image size, these
are documented in docker/README.md

docker/streamline-src/server.php

@@ -0,0 +1,21 @@
+<?php
+
+/**
+ * Laravel - A PHP Framework For Web Artisans
+ *
+ * @package  Laravel
+ * @author   Taylor Otwell <taylor@laravel.com>
+ */
+
+$uri = urldecode(
+    parse_url($_SERVER['REQUEST_URI'], PHP_URL_PATH)
+);
+
+// This file allows us to emulate Apache's "mod_rewrite" functionality from the
+// built-in PHP web server. This provides a convenient way to test a Laravel
+// application without having installed a "real" web server software here.
+if ($uri !== '/' && file_exists(__DIR__.'/public'.$uri)) {
+    return false;
+}
+
+require_once __DIR__.'/public/index.php';