policies/opa/gatekeeper/constraints/3-dep-allowed-registry-constraint.yaml

apiVersion: constraints.gatekeeper.sh/v1beta1
kind: K8sDepRegistry
metadata:
  name: deployment-allowed-registry
spec:
  match:
    kinds:
      - apiGroups: ["*"]
        kinds: ["Deployment"]
    namespaces:
      - "opa-test"
  parameters:
    allowedOps: ["CREATE","UPDATE"]
    allowedRegistries: ["GOOD_REGISTRY","VERY_GOOD_REGISTRY"]
    errMsg: "INVALID_DEPLOYMENT_REGISTRY"