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/Fragment/RoutableFragmentRenderer.php

@@ -0,0 +1,52 @@
+<?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\Fragment;
+
+use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpKernel\Controller\ControllerReference;
+use Symfony\Component\HttpKernel\EventListener\FragmentListener;
+
+/**
+ * Adds the possibility to generate a fragment URI for a given Controller.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+abstract class RoutableFragmentRenderer implements FragmentRendererInterface
+{
+    /**
+     * @internal
+     */
+    protected string $fragmentPath = '/_fragment';
+
+    /**
+     * Sets the fragment path that triggers the fragment listener.
+     *
+     * @see FragmentListener
+     *
+     * @return void
+     */
+    public function setFragmentPath(string $path)
+    {
+        $this->fragmentPath = $path;
+    }
+
+    /**
+     * Generates a fragment URI for a given controller.
+     *
+     * @param bool $absolute Whether to generate an absolute URL or not
+     * @param bool $strict   Whether to allow non-scalar attributes or not
+     */
+    protected function generateFragmentUri(ControllerReference $reference, Request $request, bool $absolute = false, bool $strict = true): string
+    {
+        return (new FragmentUriGenerator($this->fragmentPath))->generate($reference, $request, $absolute, $strict, false);
+    }
+}