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/sebastian/recursion-context/src/Context.php

@@ -0,0 +1,141 @@
+<?php declare(strict_types=1);
+/*
+ * This file is part of sebastian/recursion-context.
+ *
+ * (c) Sebastian Bergmann <sebastian@phpunit.de>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+namespace SebastianBergmann\RecursionContext;
+
+use const PHP_INT_MAX;
+use const PHP_INT_MIN;
+use function array_key_exists;
+use function array_pop;
+use function array_slice;
+use function count;
+use function is_array;
+use function random_int;
+use function spl_object_hash;
+use SplObjectStorage;
+
+final class Context
+{
+    private array $arrays = [];
+    private SplObjectStorage $objects;
+
+    public function __construct()
+    {
+        $this->objects = new SplObjectStorage;
+    }
+
+    /**
+     * @codeCoverageIgnore
+     */
+    public function __destruct()
+    {
+        foreach ($this->arrays as &$array) {
+            if (is_array($array)) {
+                array_pop($array);
+                array_pop($array);
+            }
+        }
+    }
+
+    /**
+     * @psalm-template T
+     *
+     * @psalm-param T $value
+     *
+     * @param-out T $value
+     */
+    public function add(object|array &$value): int|string|false
+    {
+        if (is_array($value)) {
+            return $this->addArray($value);
+        }
+
+        return $this->addObject($value);
+    }
+
+    /**
+     * @psalm-template T
+     *
+     * @psalm-param T $value
+     *
+     * @param-out T $value
+     */
+    public function contains(object|array &$value): int|string|false
+    {
+        if (is_array($value)) {
+            return $this->containsArray($value);
+        }
+
+        return $this->containsObject($value);
+    }
+
+    private function addArray(array &$array): int
+    {
+        $key = $this->containsArray($array);
+
+        if ($key !== false) {
+            return $key;
+        }
+
+        $key            = count($this->arrays);
+        $this->arrays[] = &$array;
+
+        if (!array_key_exists(PHP_INT_MAX, $array) && !array_key_exists(PHP_INT_MAX - 1, $array)) {
+            $array[] = $key;
+            $array[] = $this->objects;
+        } else {
+            /* Cover the improbable case, too.
+             *
+             * Note that array_slice() (used in containsArray()) will return the
+             * last two values added, *not necessarily* the highest integer keys
+             * in the array. Therefore, the order of these writes to $array is
+             * important, but the actual keys used is not. */
+            do {
+                /** @noinspection PhpUnhandledExceptionInspection */
+                $key = random_int(PHP_INT_MIN, PHP_INT_MAX);
+            } while (array_key_exists($key, $array));
+
+            $array[$key] = $key;
+
+            do {
+                /** @noinspection PhpUnhandledExceptionInspection */
+                $key = random_int(PHP_INT_MIN, PHP_INT_MAX);
+            } while (array_key_exists($key, $array));
+
+            $array[$key] = $this->objects;
+        }
+
+        return $key;
+    }
+
+    private function addObject(object $object): string
+    {
+        if (!$this->objects->contains($object)) {
+            $this->objects->attach($object);
+        }
+
+        return spl_object_hash($object);
+    }
+
+    private function containsArray(array $array): int|false
+    {
+        $end = array_slice($array, -2);
+
+        return isset($end[1]) && $end[1] === $this->objects ? $end[0] : false;
+    }
+
+    private function containsObject(object $value): string|false
+    {
+        if ($this->objects->contains($value)) {
+            return spl_object_hash($value);
+        }
+
+        return false;
+    }
+}