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/Floats.php

@@ -0,0 +1,107 @@
+<?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;
+
+
+/**
+ * Floating-point numbers comparison.
+ */
+class Floats
+{
+	use Nette\StaticClass;
+
+	private const Epsilon = 1e-10;
+
+
+	public static function isZero(float $value): bool
+	{
+		return abs($value) < self::Epsilon;
+	}
+
+
+	public static function isInteger(float $value): bool
+	{
+		return abs(round($value) - $value) < self::Epsilon;
+	}
+
+
+	/**
+	 * Compare two floats. If $a < $b it returns -1, if they are equal it returns 0 and if $a > $b it returns 1
+	 * @throws \LogicException if one of parameters is NAN
+	 */
+	public static function compare(float $a, float $b): int
+	{
+		if (is_nan($a) || is_nan($b)) {
+			throw new \LogicException('Trying to compare NAN');
+
+		} elseif (!is_finite($a) && !is_finite($b) && $a === $b) {
+			return 0;
+		}
+
+		$diff = abs($a - $b);
+		if (($diff < self::Epsilon || ($diff / max(abs($a), abs($b)) < self::Epsilon))) {
+			return 0;
+		}
+
+		return $a < $b ? -1 : 1;
+	}
+
+
+	/**
+	 * Returns true if $a = $b
+	 * @throws \LogicException if one of parameters is NAN
+	 */
+	public static function areEqual(float $a, float $b): bool
+	{
+		return self::compare($a, $b) === 0;
+	}
+
+
+	/**
+	 * Returns true if $a < $b
+	 * @throws \LogicException if one of parameters is NAN
+	 */
+	public static function isLessThan(float $a, float $b): bool
+	{
+		return self::compare($a, $b) < 0;
+	}
+
+
+	/**
+	 * Returns true if $a <= $b
+	 * @throws \LogicException if one of parameters is NAN
+	 */
+	public static function isLessThanOrEqualTo(float $a, float $b): bool
+	{
+		return self::compare($a, $b) <= 0;
+	}
+
+
+	/**
+	 * Returns true if $a > $b
+	 * @throws \LogicException if one of parameters is NAN
+	 */
+	public static function isGreaterThan(float $a, float $b): bool
+	{
+		return self::compare($a, $b) > 0;
+	}
+
+
+	/**
+	 * Returns true if $a >= $b
+	 * @throws \LogicException if one of parameters is NAN
+	 */
+	public static function isGreaterThanOrEqualTo(float $a, float $b): bool
+	{
+		return self::compare($a, $b) >= 0;
+	}
+}