chore: SearchServiceのunit-test追加 (#17035)

* add serach service test

* add meili test

* CIの修正が足りなかった

* テストの追加

* fix

.github/workflows/test-backend.yml

@@ -48,6 +48,13 @@ jobs:
         image: redis:7
         ports:
           - 56312:6379
+      meilisearch:
+        image: getmeili/meilisearch:v1.3.4
+        ports:
+          - 57712:7700
+        env:
+          MEILI_NO_ANALYTICS: true
+          MEILI_ENV: development
 
     steps:
     - uses: actions/checkout@v6.0.1