Don't restart service if sidekick is upgraded

[onedr0p]

Hi again!

Here's my use case:
We have a prometheus container deployed with a sidekick (prometheus-conf) volume for the configuration. When we deploy a new sidekick for the prometheus container we don't need it to restart the prometheus container. Instead we would have another job to reload the prometheus configuration via a curl request as described here.

I hope this makes sense. Thanks.

[onedr0p]

Looks like this might not be possible rancher/rancher#2454