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/guzzlehttp/promises/src/FulfilledPromise.php

@@ -0,0 +1,89 @@
+<?php
+
+declare(strict_types=1);
+
+namespace GuzzleHttp\Promise;
+
+/**
+ * A promise that has been fulfilled.
+ *
+ * Thenning off of this promise will invoke the onFulfilled callback
+ * immediately and ignore other callbacks.
+ *
+ * @final
+ */
+class FulfilledPromise implements PromiseInterface
+{
+    private $value;
+
+    /**
+     * @param mixed $value
+     */
+    public function __construct($value)
+    {
+        if (is_object($value) && method_exists($value, 'then')) {
+            throw new \InvalidArgumentException(
+                'You cannot create a FulfilledPromise with a promise.'
+            );
+        }
+
+        $this->value = $value;
+    }
+
+    public function then(
+        callable $onFulfilled = null,
+        callable $onRejected = null
+    ): PromiseInterface {
+        // Return itself if there is no onFulfilled function.
+        if (!$onFulfilled) {
+            return $this;
+        }
+
+        $queue = Utils::queue();
+        $p = new Promise([$queue, 'run']);
+        $value = $this->value;
+        $queue->add(static function () use ($p, $value, $onFulfilled): void {
+            if (Is::pending($p)) {
+                try {
+                    $p->resolve($onFulfilled($value));
+                } catch (\Throwable $e) {
+                    $p->reject($e);
+                }
+            }
+        });
+
+        return $p;
+    }
+
+    public function otherwise(callable $onRejected): PromiseInterface
+    {
+        return $this->then(null, $onRejected);
+    }
+
+    public function wait(bool $unwrap = true)
+    {
+        return $unwrap ? $this->value : null;
+    }
+
+    public function getState(): string
+    {
+        return self::FULFILLED;
+    }
+
+    public function resolve($value): void
+    {
+        if ($value !== $this->value) {
+            throw new \LogicException('Cannot resolve a fulfilled promise');
+        }
+    }
+
+    public function reject($reason): void
+    {
+        throw new \LogicException('Cannot reject a fulfilled promise');
+    }
+
+    public function cancel(): void
+    {
+        // pass
+    }
+}