Support ignoreDifferences within string

[DerekTBrown]

Summary

• A common pattern is to define application-specific options as YAML inside a ConfigMap.
• For the same reason as ignoreDifferences are supported within Kubernetes manifests, users may need to ignore differences inside a ConfigMap.

Motivation

For example- there are certain fields within our Kiali ConfigMap that show diffs on every update. We would like to suppress those changes in the ArgoCD UI.

Proposal

type ResourceIgnoreDifferences struct {
     ...
     JSONPointers           []string `json:"jsonPointers,omitempty" protobuf:"bytes,5,opt,name=jsonPointers"`
     JQPathExpressions      []string `json:"jqPathExpressions,omitempty" protobuf:"bytes,6,opt,name=jqPathExpressions"`
+   YAMLStringIgnoreJQPaths []string `json:"yamlStringIgnoreJQPaths,omitempty" protobuf:"bytes,6,opt,name=yamlStringIgnoreJQPaths"`

The behavior would be:

• If YAMLStringIgnoreJQPaths is non-empty, all values referred to by JSONPointers and JQPathExpressions will be parsed as YAML.
• Within those YAMLs, differences in keys referred to within YAMLStringIgnoreJQPaths will be ignored.

[andrii-korotkov-verkada]

Hm, this seems like it would be inconsistent with how JSONPointers and JQPathExpressions behave currently.

[andrii-korotkov-verkada]

I don't fully understand the motivation yet. Wouldn't setting ignoreDifferences on individual keys in the data section work?