EFS Mount Targets not created when ebextension runs...

Hi,

I have noticed that it may happen that your environment is running the ebextensions when the mount targets are not yet created. As such, the update operation fails since the mount-efs.sh script exits due to the mount points not being ready.

I added a sleep 120 in the script to take me out of the immediate issue and it solves it, but it would be good to have some kind of retry logic for that command.

从 mount-efs.sh 和运行它的 ebextension 开始；检查 mount 命令，以及在 EFS 挂载目标尚未就绪时如何处理失败。如果可能，重现启动时的竞态条件，然后验证该命令会一直重试，直到挂载目标可用，而不是导致更新失败。

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