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/FragmentHandler.php

@@ -0,0 +1,111 @@
+<?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\RequestStack;
+use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\HttpFoundation\StreamedResponse;
+use Symfony\Component\HttpKernel\Controller\ControllerReference;
+use Symfony\Component\HttpKernel\Exception\HttpException;
+
+/**
+ * Renders a URI that represents a resource fragment.
+ *
+ * This class handles the rendering of resource fragments that are included into
+ * a main resource. The handling of the rendering is managed by specialized renderers.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ *
+ * @see FragmentRendererInterface
+ */
+class FragmentHandler
+{
+    private bool $debug;
+    private array $renderers = [];
+    private RequestStack $requestStack;
+
+    /**
+     * @param FragmentRendererInterface[] $renderers An array of FragmentRendererInterface instances
+     * @param bool                        $debug     Whether the debug mode is enabled or not
+     */
+    public function __construct(RequestStack $requestStack, array $renderers = [], bool $debug = false)
+    {
+        $this->requestStack = $requestStack;
+        foreach ($renderers as $renderer) {
+            $this->addRenderer($renderer);
+        }
+        $this->debug = $debug;
+    }
+
+    /**
+     * Adds a renderer.
+     *
+     * @return void
+     */
+    public function addRenderer(FragmentRendererInterface $renderer)
+    {
+        $this->renderers[$renderer->getName()] = $renderer;
+    }
+
+    /**
+     * Renders a URI and returns the Response content.
+     *
+     * Available options:
+     *
+     *  * ignore_errors: true to return an empty string in case of an error
+     *
+     * @throws \InvalidArgumentException when the renderer does not exist
+     * @throws \LogicException           when no main request is being handled
+     */
+    public function render(string|ControllerReference $uri, string $renderer = 'inline', array $options = []): ?string
+    {
+        if (!isset($options['ignore_errors'])) {
+            $options['ignore_errors'] = !$this->debug;
+        }
+
+        if (!isset($this->renderers[$renderer])) {
+            throw new \InvalidArgumentException(sprintf('The "%s" renderer does not exist.', $renderer));
+        }
+
+        if (!$request = $this->requestStack->getCurrentRequest()) {
+            throw new \LogicException('Rendering a fragment can only be done when handling a Request.');
+        }
+
+        return $this->deliver($this->renderers[$renderer]->render($uri, $request, $options));
+    }
+
+    /**
+     * Delivers the Response as a string.
+     *
+     * When the Response is a StreamedResponse, the content is streamed immediately
+     * instead of being returned.
+     *
+     * @return string|null The Response content or null when the Response is streamed
+     *
+     * @throws \RuntimeException when the Response is not successful
+     */
+    protected function deliver(Response $response): ?string
+    {
+        if (!$response->isSuccessful()) {
+            $responseStatusCode = $response->getStatusCode();
+            throw new \RuntimeException(sprintf('Error when rendering "%s" (Status code is %d).', $this->requestStack->getCurrentRequest()->getUri(), $responseStatusCode), 0, new HttpException($responseStatusCode));
+        }
+
+        if (!$response instanceof StreamedResponse) {
+            return $response->getContent();
+        }
+
+        $response->sendContent();
+
+        return null;
+    }
+}