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/readme.md

@@ -0,0 +1,56 @@
+Nette Utility Classes
+=====================
+
+[![Downloads this Month](https://img.shields.io/packagist/dm/nette/utils.svg)](https://packagist.org/packages/nette/utils)
+[![Tests](https://github.com/nette/utils/workflows/Tests/badge.svg?branch=master)](https://github.com/nette/utils/actions)
+[![Coverage Status](https://coveralls.io/repos/github/nette/utils/badge.svg?branch=master)](https://coveralls.io/github/nette/utils?branch=master)
+[![Latest Stable Version](https://poser.pugx.org/nette/utils/v/stable)](https://github.com/nette/utils/releases)
+[![License](https://img.shields.io/badge/license-New%20BSD-blue.svg)](https://github.com/nette/utils/blob/master/license.md)
+
+
+Introduction
+------------
+
+In package nette/utils you will find a set of [useful classes](https://doc.nette.org/utils) for everyday use:
+
+- [Arrays](https://doc.nette.org/utils/arrays) - manipulate arrays
+- [Callback](https://doc.nette.org/utils/callback) - PHP callbacks
+- [Date and Time](https://doc.nette.org/utils/datetime) - modify times and dates
+- [Filesystem](https://doc.nette.org/utils/filesystem) - copying, renaming, …
+- [Finder](https://doc.nette.org/utils/finder) - finds files and directories
+- [Helper Functions](https://doc.nette.org/utils/helpers)
+- [HTML elements](https://doc.nette.org/utils/html-elements) - generate HTML
+- [Images](https://doc.nette.org/utils/images) - crop, resize, rotate images
+- [JSON](https://doc.nette.org/utils/json) - encoding and decoding
+- [Generating Random Strings](https://doc.nette.org/utils/random)
+- [Paginator](https://doc.nette.org/utils/paginator) - pagination math
+- [PHP Reflection](https://doc.nette.org/utils/reflection)
+- [Strings](https://doc.nette.org/utils/strings) - useful text functions
+- [SmartObject](https://doc.nette.org/utils/smartobject) - PHP object enhancements
+- [Validation](https://doc.nette.org/utils/validators) - validate inputs
+- [Type](https://doc.nette.org/utils/type) - PHP data type
+
+
+Installation
+------------
+
+The recommended way to install is via Composer:
+
+```
+composer require nette/utils
+```
+
+- Nette Utils 4.0 is compatible with PHP 8.0 to 8.3
+- Nette Utils 3.2 is compatible with PHP 7.2 to 8.3
+- Nette Utils 3.1 is compatible with PHP 7.1 to 8.0
+- Nette Utils 3.0 is compatible with PHP 7.1 to 8.0
+- Nette Utils 2.5 is compatible with PHP 5.6 to 8.0
+
+[Support Me](https://github.com/sponsors/dg)
+--------------------------------------------
+
+Do you like Nette Utils? Are you looking forward to the new features?
+
+[![Buy me a coffee](https://files.nette.org/icons/donation-3.svg)](https://github.com/sponsors/dg)
+
+Thank you!