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/Callback.php

@@ -0,0 +1,137 @@
+<?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;
+
+use Nette;
+use function is_array, is_object, is_string;
+
+
+/**
+ * PHP callable tools.
+ */
+final class Callback
+{
+	use Nette\StaticClass;
+
+	/**
+	 * Invokes internal PHP function with own error handler.
+	 */
+	public static function invokeSafe(string $function, array $args, callable $onError): mixed
+	{
+		$prev = set_error_handler(function ($severity, $message, $file) use ($onError, &$prev, $function): ?bool {
+			if ($file === __FILE__) {
+				$msg = ini_get('html_errors')
+					? Html::htmlToText($message)
+					: $message;
+				$msg = preg_replace("#^$function\\(.*?\\): #", '', $msg);
+				if ($onError($msg, $severity) !== false) {
+					return null;
+				}
+			}
+
+			return $prev ? $prev(...func_get_args()) : false;
+		});
+
+		try {
+			return $function(...$args);
+		} finally {
+			restore_error_handler();
+		}
+	}
+
+
+	/**
+	 * Checks that $callable is valid PHP callback. Otherwise throws exception. If the $syntax is set to true, only verifies
+	 * that $callable has a valid structure to be used as a callback, but does not verify if the class or method actually exists.
+	 * @return callable
+	 * @throws Nette\InvalidArgumentException
+	 */
+	public static function check(mixed $callable, bool $syntax = false)
+	{
+		if (!is_callable($callable, $syntax)) {
+			throw new Nette\InvalidArgumentException(
+				$syntax
+				? 'Given value is not a callable type.'
+				: sprintf("Callback '%s' is not callable.", self::toString($callable)),
+			);
+		}
+
+		return $callable;
+	}
+
+
+	/**
+	 * Converts PHP callback to textual form. Class or method may not exists.
+	 */
+	public static function toString(mixed $callable): string
+	{
+		if ($callable instanceof \Closure) {
+			$inner = self::unwrap($callable);
+			return '{closure' . ($inner instanceof \Closure ? '}' : ' ' . self::toString($inner) . '}');
+		} else {
+			is_callable(is_object($callable) ? [$callable, '__invoke'] : $callable, true, $textual);
+			return $textual;
+		}
+	}
+
+
+	/**
+	 * Returns reflection for method or function used in PHP callback.
+	 * @param  callable  $callable  type check is escalated to ReflectionException
+	 * @throws \ReflectionException  if callback is not valid
+	 */
+	public static function toReflection($callable): \ReflectionMethod|\ReflectionFunction
+	{
+		if ($callable instanceof \Closure) {
+			$callable = self::unwrap($callable);
+		}
+
+		if (is_string($callable) && str_contains($callable, '::')) {
+			return new ReflectionMethod($callable);
+		} elseif (is_array($callable)) {
+			return new ReflectionMethod($callable[0], $callable[1]);
+		} elseif (is_object($callable) && !$callable instanceof \Closure) {
+			return new ReflectionMethod($callable, '__invoke');
+		} else {
+			return new \ReflectionFunction($callable);
+		}
+	}
+
+
+	/**
+	 * Checks whether PHP callback is function or static method.
+	 */
+	public static function isStatic(callable $callable): bool
+	{
+		return is_string(is_array($callable) ? $callable[0] : $callable);
+	}
+
+
+	/**
+	 * Unwraps closure created by Closure::fromCallable().
+	 */
+	public static function unwrap(\Closure $closure): callable|array
+	{
+		$r = new \ReflectionFunction($closure);
+		$class = $r->getClosureScopeClass()?->name;
+		if (str_ends_with($r->name, '}')) {
+			return $closure;
+
+		} elseif (($obj = $r->getClosureThis()) && $obj::class === $class) {
+			return [$obj, $r->name];
+
+		} elseif ($class) {
+			return [$class, $r->name];
+
+		} else {
+			return $r->name;
+		}
+	}
+}