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/nette/utils/src/Utils/exceptions.php

@@ -0,0 +1,50 @@
+<?php
+
+/**
+ * This file is part of the Nette Framework (https://nette.org)
+ * Copyright (c) 2004 David Grudl (https://davidgrudl.com)
+ */
+
+declare(strict_types=1);
+
+namespace Nette\Utils;
+
+
+/**
+ * The exception that is thrown when an image error occurs.
+ */
+class ImageException extends \Exception
+{
+}
+
+
+/**
+ * The exception that indicates invalid image file.
+ */
+class UnknownImageFileException extends ImageException
+{
+}
+
+
+/**
+ * The exception that indicates error of JSON encoding/decoding.
+ */
+class JsonException extends \JsonException
+{
+}
+
+
+/**
+ * The exception that indicates error of the last Regexp execution.
+ */
+class RegexpException extends \Exception
+{
+}
+
+
+/**
+ * The exception that indicates assertion error.
+ */
+class AssertionException extends \Exception
+{
+}