Prevent Updates to Project

apiVersion: kyverno.io/v1
kind: ClusterPolicy
metadata:
  name: application-prevent-updates-project
  annotations:
    policies.kyverno.io/title: Prevent Updates to Project
    policies.kyverno.io/category: Argo
    policies.kyverno.io/severity: medium
    kyverno.io/kyverno-version: 1.6.2
    policies.kyverno.io/minversion: 1.6.0
    kyverno.io/kubernetes-version: "1.23"
    policies.kyverno.io/subject: Application
    policies.kyverno.io/description: This policy prevents updates to the project field after an Application is created.
spec:
  validationFailureAction: Audit
  background: true
  rules:
    - name: project-updates
      match:
        any:
          - resources:
              kinds:
                - Application
      preconditions:
        all:
          - key: "{{ request.operation || 'BACKGROUND' }}"
            operator: Equals
            value: UPDATE
      validate:
        message: The spec.project cannot be changed once the Application is created.
        deny:
          conditions:
            any:
              - key: "{{request.object.spec.project}}"
                operator: NotEquals
                value: "{{request.oldObject.spec.project}}"