Small fix

docker-compose.yml

@@ -29,7 +29,7 @@ services:
 
   db:
     image: ${DB_IMG:-postgres}:${DB_TAG:-12.4}
-    container_name: ${DB_CONTAINER_NAME-gitea-db}
+    container_name: ${DB_CONTAINER_NAME:-gitea-db}
     restart: unless-stopped
     environment:
       - POSTGRES_USER=${DB_USER}