Feature request: deploying Kubernetes StatefulSets about keel

[rusenask]

Hi guys, so the PR is merged and release candidate is available. I have tested both statefulset and daemonset updates. If you find any problems, please create separate issues :)

[rusenask]

This is definitely a wanted feature, however it will require some redesigning of the k8s provider as it would be nice to support different kinds of workloads as well - daemonset, petset.

Are you currently using StatefulSets?

[praseodym]

Yes, we're using StatefulSets for applications that require persistent storage (e.g. databases). There's no proper way to do that with Deployments.

[jaredallard]

Any plans to support this?

[rusenask]

Definitely, currently it's indirectly supported by Helm provider where you could have any type of resource.

We need further decoupling in kubernetes provider (https://github.com/keel-hq/keel/blob/master/provider/kubernetes/versioned_updates.go) from Deployment struct into some internal type which would hold just enough info but that's common to all types of resources, like labels, annotations, image version.

I will start working on splitting it up and making it easy to add new resources next week.