detect missing podSetInfo and raise fatal error (#98)

Avoid crashing the operator with an index-out-of-bounds panic
when a misconfiguration results in a workload being in the Resuming
phase without the expected assignment of PodSetInfos by Kueue.
This can happen when running in dev mode (no webhooks) and the
input appwrapper yaml didn't explicitly set suspend to True.

internal/controller/appwrapper/resource_management.go

@@ -90,7 +90,11 @@ func (r *AppWrapperReconciler) createComponent(ctx context.Context, aw *workload
 	for podSetsIdx, podSet := range component.PodSets {
 		toInject := &workloadv1beta2.AppWrapperPodSetInfo{}
 		if !r.Config.StandaloneMode {
-			toInject = &component.PodSetInfos[podSetsIdx]
+			if podSetsIdx < len(component.PodSetInfos) {
+				toInject = &component.PodSetInfos[podSetsIdx]
+			} else {
+				return nil, fmt.Errorf("missing podSetInfo %v for component %v", podSetsIdx, componentIdx), true
+			}
 		}
 
 		p, err := utils.GetRawTemplate(obj.UnstructuredContent(), podSet.Path)