didDeploy hook to publish changes

hi I would like to see something like pub/sub when deploying changes, so when a `didDeploy` event happens this add-on can exec a `PUBLISH ${keyPrefix}:deploy ${revisionKey}` and a fastboot-notifier can be listen on that channel events and trigger a notification to download the new app version. let me know if that sound good to you and if I can help implementing this. thanks

首先追踪 deployment 生命周期在哪里暴露 `didDeploy` 事件，以及此 add-on 当前如何写入 Redis key。与 maintainers 澄清预期的 `${keyPrefix}:deploy` channel 和 `revisionKey` payload，然后确认对于发布和 `fastboot-notifier` listener 而言“done”意味着什么；issue 中没有指定任何 implementation file 或 test。

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