fix(image-lab): env 변수를 다른 -lab과 동일하게 정렬 (TZ + :- defaults)

docker-compose.yml

@@ -120,10 +120,11 @@ services:
     ports:
       - "18802:8000"
     environment:
-      - REDIS_URL=redis://redis:6379
-      - INTERNAL_API_KEY=${INTERNAL_API_KEY}
+      - TZ=${TZ:-Asia/Seoul}
+      - REDIS_URL=${REDIS_URL:-redis://redis:6379}
+      - INTERNAL_API_KEY=${INTERNAL_API_KEY:-}
       - IMAGE_DATA_DIR=/app/data
-      - CORS_ALLOW_ORIGINS=http://localhost:3007,http://localhost:8080
+      - CORS_ALLOW_ORIGINS=${CORS_ALLOW_ORIGINS:-http://localhost:3007,http://localhost:8080}
     volumes:
       - ${RUNTIME_PATH}/data/image:/app/data
     depends_on: