* Fix controller timer handler not return when error occurred
* Fix controller not close http response correctly
This PR aims to fix controller not close response correctly. Also, I’ve check all over the project there is no more resource leak issues exist after this patch.
* Fix controller not return immediately when error occurred
* Sort import
This change adds a timer trigger API, client, and implementation. Users can trigger a function with a cron-compatible string.
This change also moves the publisher interface and webhook-based publisher implementation out of kubewatcher and into a separate `publisher` package.
