[FEATURE][issue#32554] Added caching to the storeConfig GraphQl Endpoint

Author: lewisvoncken

app/code/Magento/StoreGraphQl/Model/Resolver/Store/Identity.php

@@ -0,0 +1,31 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+declare(strict_types=1);
+
+namespace Magento\StoreGraphQl\Model\Resolver\Store;
+
+use Magento\Framework\GraphQl\Query\Resolver\IdentityInterface;
+use Magento\Framework\App\Config;
+
+class Identity implements IdentityInterface
+{
+    /**
+     * @var string
+     */
+    private $cacheTag = Config::CACHE_TAG;
+
+    /**
+     * @inheritDoc
+     */
+    public function getIdentities(array $resolvedData): array
+    {
+        $ids =  empty($resolvedData) ?
+            [] : array_merge([$this->cacheTag], array_map(function ($key) {
+                return sprintf('%s_%s', $this->cacheTag, $key);
+            }, array_keys($resolvedData)));
+        return $ids;
+    }
+}

app/code/Magento/StoreGraphQl/etc/schema.graphqls

@@ -1,7 +1,7 @@
 # Copyright © Magento, Inc. All rights reserved.
 # See COPYING.txt for license details.
 type Query {
-    storeConfig : StoreConfig @resolver(class: "Magento\\StoreGraphQl\\Model\\Resolver\\StoreConfigResolver") @doc(description: "The store config query") @cache(cacheable: false)
+    storeConfig : StoreConfig @resolver(class: "Magento\\StoreGraphQl\\Model\\Resolver\\StoreConfigResolver") @doc(description: "The store config query") @cache(cacheIdentity: "Magento\\StoreGraphQl\\Model\\Resolver\\Store\\Identity")
     availableStores(
         useCurrentGroup: Boolean @doc(description: "Filter store views by current store group")
     ): [StoreConfig] @resolver(class: "Magento\\StoreGraphQl\\Model\\Resolver\\AvailableStoresResolver") @doc(description: "Get a list of available store views and their config information.")