fix bubble unit and revert alloy

image/overlay/etc/init.d/bubble

@@ -5,7 +5,10 @@ depend() {
 }
 
 start_pre() {
-  docker pull git.sfclub.cc/cloud/workspace-image:latest
+	 until docker info >/dev/null 2>&1; do
+		  sleep 2
+	 done
+    docker pull git.sfclub.cc/cloud/workspace-image:latest
 }
 
 command="/usr/bin/bubble"