Issue #3445189 add Git integration

Closes #3445189

modules/aue_git/src/GitCommitUpdater.php

+<?php
+
+namespace Drupal\aue_git;
+
+use CzProject\GitPhp\Git;
+use CzProject\GitPhp\GitException;
+use Drupal\Core\StringTranslation\StringTranslationTrait;
+use Drupal\package_manager\Event\PostApplyEvent;
+use Drupal\package_manager\Event\PreApplyEvent;
+use Drupal\package_manager\Event\StatusCheckEvent;
+use Drupal\package_manager\PathLocator;
+use Symfony\Component\EventDispatcher\EventSubscriberInterface;
+
+class GitCommitUpdater implements EventSubscriberInterface {
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function getSubscribedEvents(): array {
+    return [
+      StatusCheckEvent::class => 'onStatusCheck',
+//      PreApplyEvent::class => 'checkGitStatus',
+//      PostApplyEvent::class => 'onPostApply',
+    ];
+  }
+
+  use StringTranslationTrait;
+
+  public function __construct(private PathLocator $pathLocator) {
+  }
+
+  /**
+   * Ensure that the Git repository exists and that working directory is clean
+   *
+   * @param \Drupal\package_manager\Event\StatusCheckEvent $event
+   */
+  public function onStatusCheck(StatusCheckEvent $event): void {
+
+    if (in_array($event->stage->getType(), ['automatic_updates:unattended', 'automatic_updates:attended'])) {
+
+      $git = new Git();
+
+      $project_root = $this->pathLocator->getProjectRoot();
+
+      try {
+        $repo = $git->open($project_root);
+      }
+      catch (GitException $exception) {
+        // @TODO: Should this be an error or a warning?
+        $event->addWarning([t("No Git repository detected.")]);
+        return;
+      }
+
+      if($repo->hasChanges()) {
+        $changes = $repo->execute("status");
+        $imploded = implode("\n", $changes);
+        $event->addError([t($imploded)], t("Cannot move forward with Package Manager operations: There are uncommitted changes in Git."));
+      }
+    }
+  }
+
+  /**
+   * Make a Git commit after updating.
+   *
+   * @param \Drupal\package_manager\Event\PostApplyEvent $event
+   */
+  public function onPostApply(PostApplyEvent $event): void {
+    if ($event->stage->getType() === 'automatic_updates:attended') {
+      $this->makeGitCommit($this->pathLocator->getProjectRoot());
+    }
+  }
+
+  private function makeGitCommit(string $projectRoot) {
+
+  }
+}
+