feature #34387 [Yaml] Added yaml-lint binary (jschaedl)

This PR was merged into the 5.1-dev branch.

Discussion
----------

[Yaml] Added yaml-lint binary

| Q             | A
| ------------- | ---
| Branch?       | 5.1
| Bug fix?      | no
| New feature?  | yes
| Deprecations? | no <!-- please update UPGRADE-*.md and src/**/CHANGELOG.md files -->
| Tickets       | Fix #18987  <!-- prefix each issue number with "Fix #", if any -->
| License       | MIT
| Doc PR        | tbd.
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Commits
-------

2640dfe [Yaml] Introduce yaml-lint binary

src/Symfony/Component/Yaml/CHANGELOG.md

@@ -1,6 +1,11 @@
 CHANGELOG
 =========
 
+5.1.0
+-----
+
+ * Added `yaml-lint` binary.
+
 5.0.0
 -----
 

src/Symfony/Component/Yaml/Resources/bin/yaml-lint

@@ -0,0 +1,49 @@
+#!/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.
+ */
+
+/**
+ * Runs the Yaml lint command.
+ *
+ * @author Jan Schädlich <jan.schaedlich@sensiolabs.de>
+ */
+
+use Psr\Log\LoggerInterface;
+use Symfony\Component\Console\Application;
+use Symfony\Component\Console\Input\ArgvInput;
+use Symfony\Component\Console\Logger\ConsoleLogger;
+use Symfony\Component\Console\Output\ConsoleOutput;
+use Symfony\Component\Yaml\Command\LintCommand;
+
+function includeIfExists(string $file): bool
+{
+    return file_exists($file) && include $file;
+}
+
+if (
+    !includeIfExists(__DIR__ . '/../../../../autoload.php') &&
+    !includeIfExists(__DIR__ . '/../../vendor/autoload.php') &&
+    !includeIfExists(__DIR__ . '/../../../../../../vendor/autoload.php')
+) {
+    fwrite(STDERR, 'Install dependencies using Composer.'.PHP_EOL);
+    exit(1);
+}
+
+if (!class_exists(Application::class)) {
+    fwrite(STDERR, 'You need the "symfony/console" component in order to run the Yaml linter.'.PHP_EOL);
+    exit(1);
+}
+
+(new Application())->add($command = new LintCommand())
+    ->getApplication()
+    ->setDefaultCommand($command->getName(), true)
+    ->run()
+;

src/Symfony/Component/Yaml/composer.json

@@ -34,6 +34,9 @@
             "/Tests/"
         ]
     },
+    "bin": [
+        "Resources/bin/yaml-lint"
+    ],
     "minimum-stability": "dev",
     "extra": {
         "branch-alias": {