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-kernel/RebootableInterface.php

@@ -0,0 +1,32 @@
+<?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\HttpKernel;
+
+/**
+ * Allows the Kernel to be rebooted using a temporary cache directory.
+ *
+ * @author Nicolas Grekas <p@tchwork.com>
+ */
+interface RebootableInterface
+{
+    /**
+     * Reboots a kernel.
+     *
+     * The getBuildDir() method of a rebootable kernel should not be called
+     * while building the container. Use the %kernel.build_dir% parameter instead.
+     *
+     * @param string|null $warmupDir pass null to reboot in the regular build directory
+     *
+     * @return void
+     */
+    public function reboot(?string $warmupDir);
+}