Fixes #39 

### Motivation

The match expression for the "app" label was incorrect breaking the antiaffinity since they would never match. Fixing this makes the podAntiAffinity work, but now requires at least N nodes to be in the cluster where N = largest replica set with affinity. Added the option to set the affinity type to preferredDuringSchedulingIgnoredDuringExecution where it will try to follow the affinity, but will still deploy a pod if it needs to break it. 

### Modifications

- Fixed app matchExpression 
- Added option to set the affinity type 
- bumped chart version

### Verifying this change

- [X] Make sure that the change passes the CI checks.