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/symfony/error-handler/README.md

@@ -0,0 +1,44 @@
+ErrorHandler Component
+======================
+
+The ErrorHandler component provides tools to manage errors and ease debugging PHP code.
+
+Getting Started
+---------------
+
+```
+$ composer require symfony/error-handler
+```
+
+```php
+use Symfony\Component\ErrorHandler\Debug;
+use Symfony\Component\ErrorHandler\ErrorHandler;
+use Symfony\Component\ErrorHandler\DebugClassLoader;
+
+Debug::enable();
+
+// or enable only one feature
+//ErrorHandler::register();
+//DebugClassLoader::enable();
+
+// If you want a custom generic template when debug is not enabled
+// HtmlErrorRenderer::setTemplate('/path/to/custom/error.html.php');
+
+$data = ErrorHandler::call(static function () use ($filename, $datetimeFormat) {
+    // if any code executed inside this anonymous function fails, a PHP exception
+    // will be thrown, even if the code uses the '@' PHP silence operator
+    $data = json_decode(file_get_contents($filename), true);
+    $data['read_at'] = date($datetimeFormat);
+    file_put_contents($filename, json_encode($data));
+
+    return $data;
+});
+```
+
+Resources
+---------
+
+ * [Contributing](https://symfony.com/doc/current/contributing/index.html)
+ * [Report issues](https://github.com/symfony/symfony/issues) and
+   [send Pull Requests](https://github.com/symfony/symfony/pulls)
+   in the [main Symfony repository](https://github.com/symfony/symfony)