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/nikic/php-parser/lib/PhpParser/NodeTraverserInterface.php

@@ -0,0 +1,26 @@
+<?php declare(strict_types=1);
+
+namespace PhpParser;
+
+interface NodeTraverserInterface {
+    /**
+     * Adds a visitor.
+     *
+     * @param NodeVisitor $visitor Visitor to add
+     */
+    public function addVisitor(NodeVisitor $visitor): void;
+
+    /**
+     * Removes an added visitor.
+     */
+    public function removeVisitor(NodeVisitor $visitor): void;
+
+    /**
+     * Traverses an array of nodes using the registered visitors.
+     *
+     * @param Node[] $nodes Array of nodes
+     *
+     * @return Node[] Traversed array of nodes
+     */
+    public function traverse(array $nodes): array;
+}