feat: convert output to framework results

[abdalazizmoh]

Hi 👋

This PR is for converting Json error output to Yaml format to be more readable

Build the tool

go build -o 'dist/kubeconformvalidator' .

Testing using /example directory :

cat example/krm-function-input.yaml| ./dist/kubeconformvalidator

The output display in framework.Results format:

apiVersion: config.kubernetes.io/v1
kind: ResourceList
items: []
functionConfig:
  kind: KubeconformValidator
  apiVersion: validators.kustomize.aabouzaid.com/v1alpha1
  metadata:
    name: validate
  spec:
    config:
      output: json
    args:
    - -strict
    - -output
    - text
results:
- message: expected integer, but got string
  severity: error
  resourceRef:
    kind: Service
    name: service-invalid
  field:
    path: /spec/ports/0/port
    proposedValue: 1
- message: expected integer, but got string
  severity: error
  resourceRef:
    kind: Service
    name: service2-invalid
  field:
    path: /spec/ports/0/port
    proposedValue: 1

Thanks

[aabouzaid]

@abdalazizmoh Your code looks good to me, but there is something odd when it's used in Kustomize (it could be a bug in Kustomize itself).

As I understand, if the plugin returned a non-empty ".results" and one of the items has a severity error, then Kustomize should exit with non-zero. 🤔

Maybe we need to verify that and understand what is the expected behavior in Kustomize.
Could you please make a PoC and open an issue in the Kustomize project? (after searching in case that's a known issue).