Add `curl` to redis docker image

[Ali Afsharzadeh]

Redis Sentinel mode includes a configuration option that allows notifications (to an administrator or client) when a failover occurs. This feature is documented in the sentinel.conf.

When attempting to utilize this notification feature, I encountered a problem: curl is not installed in the image. I also attempted to use wget to send an HTTP request, but the wget included with busybox cannot handle HTTPS proxies.

Could curl be added to the redis docker image? This would enable the notification feature to function correctly by allowing HTTP requests to be sent reliably.

Thank you!