Add cache busting via save method of collection repository

lib/Alchemy/Phrasea/Collection/Repository/CachedCollectionRepository.php

@@ -55,7 +55,7 @@ final class CachedCollectionRepository implements CollectionRepository
      */
     public function findAll()
     {
-        $cacheKey = hash('sha256', $this->cacheKey . '.findAll');
+        $cacheKey = hash('sha256', $this->cacheKey);
         /** @var \collection[] $collections */
         $collections = $this->cache->fetch($cacheKey);
 
@@ -86,6 +86,15 @@ final class CachedCollectionRepository implements CollectionRepository
         return null;
     }
 
+    public function save(\collection $collection)
+    {
+        $this->repository->save($collection);
+
+        $cacheKey = hash('sha256', $this->cacheKey);
+
+        $this->cache->delete($cacheKey);
+    }
+
     private function putInCache($key, $value)
     {
         $this->cache->save($key, $value);