refactor(container): simplify Redis pool initialization flow

- Remove redundant `$container` parameter in `RedisPoolInitializer` instantiation.
- Streamline container interactions for improved clarity and maintainability.

docker-compose.staging.yml

@@ -353,7 +353,7 @@ services:
       - TZ=Europe/Berlin
       - APP_ENV=staging
       - APP_DEBUG=${APP_DEBUG:-true}
-      # Database
+      # Database (can share with production or use separate)
       - DB_HOST=${DB_HOST:-postgres}
       - DB_PORT=${DB_PORT:-5432}
       - DB_DATABASE=${DB_DATABASE:-michaelschiemer_staging}
@@ -408,7 +408,7 @@ services:
       - TZ=Europe/Berlin
       - APP_ENV=staging
       - APP_DEBUG=${APP_DEBUG:-true}
-      # Database
+      # Database (can share with production or use separate)
       - DB_HOST=${DB_HOST:-postgres}
       - DB_PORT=${DB_PORT:-5432}
       - DB_DATABASE=${DB_DATABASE:-michaelschiemer_staging}
@@ -471,6 +471,9 @@ networks:
     external: true
   staging-internal:
     driver: bridge
+  app-internal:
+    external: true
+    name: app-internal
 
 volumes:
   staging-code: