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/psy/psysh/src/Readline/Readline.php

@@ -0,0 +1,86 @@
+<?php
+
+/*
+ * This file is part of Psy Shell.
+ *
+ * (c) 2012-2023 Justin Hileman
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Psy\Readline;
+
+/**
+ * An interface abstracting the various readline_* functions.
+ */
+interface Readline
+{
+    /**
+     * @param string|false $historyFile
+     * @param int|null     $historySize
+     * @param bool|null    $eraseDups
+     */
+    public function __construct($historyFile = null, $historySize = 0, $eraseDups = false);
+
+    /**
+     * Check whether this Readline class is supported by the current system.
+     */
+    public static function isSupported(): bool;
+
+    /**
+     * Check whether this Readline class supports bracketed paste.
+     */
+    public static function supportsBracketedPaste(): bool;
+
+    /**
+     * Add a line to the command history.
+     *
+     * @param string $line
+     *
+     * @return bool Success
+     */
+    public function addHistory(string $line): bool;
+
+    /**
+     * Clear the command history.
+     *
+     * @return bool Success
+     */
+    public function clearHistory(): bool;
+
+    /**
+     * List the command history.
+     *
+     * @return string[]
+     */
+    public function listHistory(): array;
+
+    /**
+     * Read the command history.
+     *
+     * @return bool Success
+     */
+    public function readHistory(): bool;
+
+    /**
+     * Read a single line of input from the user.
+     *
+     * @param string|null $prompt
+     *
+     * @return false|string
+     */
+    public function readline(string $prompt = null);
+
+    /**
+     * Redraw readline to redraw the display.
+     */
+    public function redisplay();
+
+    /**
+     * Write the command history to a file.
+     *
+     * @return bool Success
+     */
+    public function writeHistory(): bool;
+}