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/Resources/bin/extract-tentative-return-types.php

@@ -0,0 +1,84 @@
+#!/usr/bin/env php
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+if ('cli' !== \PHP_SAPI) {
+    throw new Exception('This script must be run from the command line.');
+}
+
+// Run from the root of the php-src repository, this script generates
+// a table with all the methods that have a tentative return type.
+//
+// Usage: find -name *.stub.php | sort | /path/to/extract-tentative-return-types.php > /path/to/TentativeTypes.php
+
+echo <<<EOPHP
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\ErrorHandler\Internal;
+
+/**
+ * This class has been generated by extract-tentative-return-types.php.
+ *
+ * @internal
+ */
+class TentativeTypes
+{
+    public const RETURN_TYPES = [
+
+EOPHP;
+
+while (false !== $file = fgets(\STDIN)) {
+    $code = file_get_contents(substr($file, 0, -1));
+
+    if (!str_contains($code, '@tentative-return-type')) {
+        continue;
+    }
+
+    $code = preg_split('{^\s*(?:(?:abstract )?class|interface|trait) ([^\s]++)}m', $code, -1, \PREG_SPLIT_DELIM_CAPTURE);
+
+    if (1 === count($code)) {
+        continue;
+    }
+
+    for ($i = 1; null !== $class = $code[$i] ?? null; $i += 2) {
+        $methods = $code[1 + $i];
+
+        if (!str_contains($methods, '@tentative-return-type')) {
+            continue;
+        }
+
+        echo "        '$class' => [\n";
+
+        preg_replace_callback('{@tentative-return-type.*?[\s]function ([^(]++)[^)]++\)\s*+:\s*+([^\n;\{]++)}s', function ($m) {
+            $m[2] = str_replace(' ', '', $m[2]);
+            echo "            '$m[1]' => '$m[2]',\n";
+
+            return '';
+        }, $methods);
+
+        echo "        ],\n";
+    }
+}
+
+echo <<<EOPHP
+    ];
+}
+
+EOPHP;

docker/streamline-src/vendor/symfony/error-handler/Resources/bin/patch-type-declarations

@@ -0,0 +1,98 @@
+#!/usr/bin/env php
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+if ('cli' !== \PHP_SAPI) {
+    throw new Exception('This script must be run from the command line.');
+}
+
+if (\in_array('-h', $argv) || \in_array('--help', $argv)) {
+    echo implode(PHP_EOL, [
+        ' Patches type declarations based on "@return" PHPDoc and triggers deprecations for',
+        ' incompatible method declarations.',
+        '',
+        ' This assists you to make your package compatible with Symfony 6, but it can be used',
+        ' for any class/package.',
+        '',
+        ' Available configuration via environment variables:',
+        '  SYMFONY_PATCH_TYPE_DECLARATIONS',
+        '      A url-encoded string to change the behavior of the script. Available parameters:',
+        '      - "force": any value enables deprecation notices - can be any of:',
+        '          - "phpdoc" to patch only docblock annotations',
+        '          - "2" to add all possible return types',
+        '          - "1" to add return types but only to tests/final/internal/private methods',
+        '      - "php": the target version of PHP - e.g. "7.1" doesn\'t generate "object" types',
+        '      - "deprecations": "1" to trigger a deprecation notice when a child class misses a',
+        '                        return type while the parent declares an "@return" annotation',
+        '',
+        '  SYMFONY_PATCH_TYPE_EXCLUDE',
+        '      A regex matched against the full path to the class - any match will be excluded',
+        '',
+        ' Example: "SYMFONY_PATCH_TYPE_DECLARATIONS=php=7.4 ./patch-type-declarations"',
+    ]);
+    exit;
+}
+
+if (false === getenv('SYMFONY_PATCH_TYPE_DECLARATIONS')) {
+    putenv('SYMFONY_PATCH_TYPE_DECLARATIONS=force=2');
+    echo 'No SYMFONY_PATCH_TYPE_DECLARATIONS env var set, patching type declarations in all methods (run the command with "-h" for more information).'.PHP_EOL;
+}
+
+if (is_file($autoload = __DIR__.'/../../../../autoload.php')) {
+    // noop
+} elseif (is_file($autoload = __DIR__.'/../../../../../../../autoload.php')) {
+    // noop
+} else {
+    echo PHP_EOL.'  /!\ Cannot find the Composer autoloader, did you forget to run "composer install"?'.PHP_EOL;
+    exit(1);
+}
+
+if (is_file($phpunitAutoload = dirname($autoload).'/bin/.phpunit/phpunit/vendor/autoload.php')) {
+    require $phpunitAutoload;
+}
+
+$loader = require $autoload;
+
+Symfony\Component\ErrorHandler\DebugClassLoader::enable();
+
+$deprecations = [];
+set_error_handler(function ($type, $msg, $file, $line, $context = []) use (&$deprecations) {
+    if (\E_USER_DEPRECATED !== $type) {
+        return;
+    }
+
+    [,,,,, $class,] = explode('"', $msg);
+    $deprecations[$class][] = $msg;
+});
+
+$exclude = getenv('SYMFONY_PATCH_TYPE_EXCLUDE') ?: null;
+foreach ($loader->getClassMap() as $class => $file) {
+    if (str_contains($file = realpath($file), \DIRECTORY_SEPARATOR.'vendor'.\DIRECTORY_SEPARATOR)) {
+        continue;
+    }
+
+    if ($exclude && preg_match($exclude, $file)) {
+        continue;
+    }
+
+    class_exists($class);
+}
+
+Symfony\Component\ErrorHandler\DebugClassLoader::checkClasses();
+
+foreach ($deprecations as $class => $classDeprecations) {
+    echo $class.' ('.\count($classDeprecations).')'.PHP_EOL;
+    echo implode(PHP_EOL, $classDeprecations).PHP_EOL.PHP_EOL;
+}
+
+if ($deprecations && str_contains(getenv('SYMFONY_PATCH_TYPE_DECLARATIONS') ?? '', 'force')) {
+    echo 'These deprecations might be fixed by the patch script, run this again to check for type deprecations.'.PHP_EOL;
+}