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/composer.json

@@ -0,0 +1,51 @@
+{
+	"name": "nette/utils",
+	"description": "🛠  Nette Utils: lightweight utilities for string & array manipulation, image handling, safe JSON encoding/decoding, validation, slug or strong password generating etc.",
+	"keywords": ["nette", "images", "json", "password", "validation", "utility", "string", "array", "core", "slugify", "utf-8", "unicode", "paginator", "datetime"],
+	"homepage": "https://nette.org",
+	"license": ["BSD-3-Clause", "GPL-2.0-only", "GPL-3.0-only"],
+	"authors": [
+		{
+			"name": "David Grudl",
+			"homepage": "https://davidgrudl.com"
+		},
+		{
+			"name": "Nette Community",
+			"homepage": "https://nette.org/contributors"
+		}
+	],
+	"require": {
+		"php": ">=8.0 <8.4"
+	},
+	"require-dev": {
+		"nette/tester": "^2.5",
+		"tracy/tracy": "^2.9",
+		"phpstan/phpstan": "^1.0",
+		"jetbrains/phpstorm-attributes": "dev-master"
+	},
+	"conflict": {
+		"nette/finder": "<3",
+		"nette/schema": "<1.2.2"
+	},
+	"suggest": {
+		"ext-iconv": "to use Strings::webalize(), toAscii(), chr() and reverse()",
+		"ext-json": "to use Nette\\Utils\\Json",
+		"ext-intl": "to use Strings::webalize(), toAscii(), normalize() and compare()",
+		"ext-mbstring": "to use Strings::lower() etc...",
+		"ext-gd": "to use Image",
+		"ext-tokenizer": "to use Nette\\Utils\\Reflection::getUseStatements()"
+	},
+	"autoload": {
+		"classmap": ["src/"]
+	},
+	"minimum-stability": "dev",
+	"scripts": {
+		"phpstan": "phpstan analyse",
+		"tester": "tester tests -s"
+	},
+	"extra": {
+		"branch-alias": {
+			"dev-master": "4.0-dev"
+		}
+	}
+}