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/vendor/symfony/http-foundation/Session/SessionBagInterface.php

@@ -0,0 +1,44 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\HttpFoundation\Session;
+
+/**
+ * Session Bag store.
+ *
+ * @author Drak <drak@zikula.org>
+ */
+interface SessionBagInterface
+{
+    /**
+     * Gets this bag's name.
+     */
+    public function getName(): string;
+
+    /**
+     * Initializes the Bag.
+     *
+     * @return void
+     */
+    public function initialize(array &$array);
+
+    /**
+     * Gets the storage key for this bag.
+     */
+    public function getStorageKey(): string;
+
+    /**
+     * Clears out data from bag.
+     *
+     * @return mixed Whatever data was contained
+     */
+    public function clear(): mixed;
+}