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/css-selector/Node/HashNode.php

@@ -0,0 +1,54 @@
+<?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\CssSelector\Node;
+
+/**
+ * Represents a "<selector>#<id>" node.
+ *
+ * This component is a port of the Python cssselect library,
+ * which is copyright Ian Bicking, @see https://github.com/SimonSapin/cssselect.
+ *
+ * @author Jean-François Simon <jeanfrancois.simon@sensiolabs.com>
+ *
+ * @internal
+ */
+class HashNode extends AbstractNode
+{
+    private NodeInterface $selector;
+    private string $id;
+
+    public function __construct(NodeInterface $selector, string $id)
+    {
+        $this->selector = $selector;
+        $this->id = $id;
+    }
+
+    public function getSelector(): NodeInterface
+    {
+        return $this->selector;
+    }
+
+    public function getId(): string
+    {
+        return $this->id;
+    }
+
+    public function getSpecificity(): Specificity
+    {
+        return $this->selector->getSpecificity()->plus(new Specificity(1, 0, 0));
+    }
+
+    public function __toString(): string
+    {
+        return sprintf('%s[%s#%s]', $this->getNodeName(), $this->selector, $this->id);
+    }
+}