add keep alive

Dockerfile

@@ -1,6 +1,8 @@
 FROM ubuntu:22.04
 
 ENV DEBIAN_FRONTEND=noninteractive
+ENV PING_URL=https://zhanghuaao-code-server.hf.space/
+ENV PING_INTERVAL=3600
 
 # 基础依赖
 RUN apt-get update && apt-get install -y --no-install-recommends \

start.sh

@@ -1,6 +1,21 @@
 #!/usr/bin/env bash
 set -e
 
+# ===== Keepalive: 后台定时 curl（可用环境变量控制）=====
+PING_URL="${PING_URL:-}"
+PING_INTERVAL="${PING_INTERVAL:-300}"
+
+if [ -n "$PING_URL" ]; then
+  (
+    while true; do
+      echo "[keepalive] $(date -Iseconds) curl $PING_URL"
+      curl -fsS -L --max-time 20 "$PING_URL" >/dev/null 2>&1 || true
+      sleep "$PING_INTERVAL"
+    done
+  ) &
+fi
+# =========================================================
+
 mkdir -p /home/coder/.config/code-server
 
 # 生成配置文件