add healthcheck to backend service with 10s interval and 5 retries

docker-compose.prod.yml

@@ -23,6 +23,12 @@ services:
       JWT_SECRET: ${JWT_SECRET}
       SEED_ADMIN_PASSWORD: ${SEED_ADMIN_PASSWORD}
     # Нет expose - backend доступен только внутри сети delivery-network
+    healthcheck:
+      test: ["CMD-SHELL", "wget -qO- http://localhost:8080/health || exit 1"]
+      interval: 10s
+      timeout: 5s
+      retries: 5
+
     depends_on:
       postgres:
         condition: service_healthy