fix: update deployment script to change directory to /root before reloading Caddy

.drone.yml

@@ -29,7 +29,7 @@ steps:
       - pkill -f short-link-server || true
       # nohup 启动，日志输出到 nohup.out
       - nohup ./short-link-server > nohup.out 2>&1 &
-      - cd ~
+      - cd /root
       - caddy reload
     depends_on:
       - build-backend