Add exception for union type in scheduling API

We need to add a marker to allow podgroup to be marked up correctly as a union type, and then teach the nonpointerstructs linter how to understand this

hack/golangci-hints.yaml

@@ -224,6 +224,13 @@ linters:
       # jsontags: 'Port' must be capitalized for backward compatibility
       - text: 'jsontags: field DaemonEndpoint.Port json tag does not match'
         path: "staging/src/k8s.io/api/core/v1/types.go"
+      
+      # NonPointerStructs - Existing fields that are non-pointer structs but where the current rules are incorrect.
+      
+      # The PodGroup.Policy field is a union type, but is not marked up as a union, nor does nonpointerstructs understand unions today.
+      # Validation makes this require at least one of the fields within to be set.
+      - text: "nonpointerstructs: field PodGroup.Policy is a non-pointer struct with no required fields. It must be marked as optional."
+        path: "staging/src/k8s.io/api/scheduling/v1alpha1/types.go"
 
       - linters:
         - forbidigo

hack/golangci.yaml

@@ -235,6 +235,13 @@ linters:
       # jsontags: 'Port' must be capitalized for backward compatibility
       - text: 'jsontags: field DaemonEndpoint.Port json tag does not match'
         path: "staging/src/k8s.io/api/core/v1/types.go"
+      
+      # NonPointerStructs - Existing fields that are non-pointer structs but where the current rules are incorrect.
+      
+      # The PodGroup.Policy field is a union type, but is not marked up as a union, nor does nonpointerstructs understand unions today.
+      # Validation makes this require at least one of the fields within to be set.
+      - text: "nonpointerstructs: field PodGroup.Policy is a non-pointer struct with no required fields. It must be marked as optional."
+        path: "staging/src/k8s.io/api/scheduling/v1alpha1/types.go"
 
       - linters:
         - forbidigo

hack/kube-api-linter/exceptions.yaml

@@ -100,3 +100,10 @@
 # jsontags: 'Port' must be capitalized for backward compatibility
 - text: 'jsontags: field DaemonEndpoint.Port json tag does not match'
   path: "staging/src/k8s.io/api/core/v1/types.go"
+
+# NonPointerStructs - Existing fields that are non-pointer structs but where the current rules are incorrect.
+
+# The PodGroup.Policy field is a union type, but is not marked up as a union, nor does nonpointerstructs understand unions today.
+# Validation makes this require at least one of the fields within to be set.
+- text: "nonpointerstructs: field PodGroup.Policy is a non-pointer struct with no required fields. It must be marked as optional."
+  path: "staging/src/k8s.io/api/scheduling/v1alpha1/types.go"