Add support for "Documentation" label

Author: Kocal

src/Api/Issue/IssueType.php

@@ -10,4 +10,5 @@ class IssueType
     public const FEATURE = 'Feature';
     public const UNKNOWN = 'Unknown';
     public const RFC = 'RFC';
+    public const DOCUMENTATION = 'Documentation';
 }

src/Command/PingStaleIssuesCommand.php

@@ -95,6 +95,7 @@ private function extractType(array $issue): string
             IssueType::FEATURE => false,
             IssueType::BUG => false,
             IssueType::RFC => false,
+            IssueType::DOCUMENTATION => false,
         ];
 
         foreach ($issue['labels'] as $label) {

src/Subscriber/AutoLabelFromContentSubscriber.php

@@ -40,7 +40,7 @@ public function onPullRequest(GitHubEvent $event): void
             $prLabels[] = $label;
         }
 
-        // the PR body usually indicates if this is a Bug, Feature, BC Break or Deprecation
+        // the PR body usually indicates if this is a Bug, Feature, BC Break, Deprecation or Documentation
         if (preg_match('/\|\s*Bug fix\?\s*\|\s*yes\s*/i', $prBody, $matches)) {
             $prLabels[] = 'Bug';
         }
@@ -53,6 +53,9 @@ public function onPullRequest(GitHubEvent $event): void
         if (preg_match('/\|\s*Deprecations\?\s*\|\s*yes\s*/i', $prBody, $matches)) {
             $prLabels[] = 'Deprecation';
         }
+        if (preg_match('/\|\s*Documentation\?\s*\|\s*yes\s*/i', $prBody, $matches)) {
+            $prLabels[] = 'Documentation';
+        }
 
         $this->labelsApi->addIssueLabels($prNumber, $prLabels, $repository);