Operator SDK tutorial for Hybrid Helm Operators

# Use the 'create api' subcommand to add watches to this file.
- group: cache.my.domain
  version: v1
  kind: Memcached
  chart: helm-charts/memcached
#+kubebuilder:scaffold:watch

// Operator's main.go
// With the help of helpers provided in the library, the reconciler can be
// configured here before starting the controller with this reconciler.
reconciler := reconciler.New(
 reconciler.WithChart(*chart),
 reconciler.WithGroupVersionKind(gvk),
)

if err := reconciler.SetupWithManager(mgr); err != nil {
 panic(fmt.Sprintf("unable to create reconciler: %s", err))
}

...
	for _, w := range ws {
		// Register controller with the factory
		reconcilePeriod := defaultReconcilePeriod
		if w.ReconcilePeriod != nil {
			reconcilePeriod = w.ReconcilePeriod.Duration
		}

		maxConcurrentReconciles := defaultMaxConcurrentReconciles
		if w.MaxConcurrentReconciles != nil {
			maxConcurrentReconciles = *w.MaxConcurrentReconciles
		}

		r, err := reconciler.New(
			reconciler.WithChart(*w.Chart),
			reconciler.WithGroupVersionKind(w.GroupVersionKind),
			reconciler.WithOverrideValues(w.OverrideValues),
			reconciler.SkipDependentWatches(w.WatchDependentResources != nil && !*w.WatchDependentResources),
			reconciler.WithMaxConcurrentReconciles(maxConcurrentReconciles),
			reconciler.WithReconcilePeriod(reconcilePeriod),
			reconciler.WithInstallAnnotations(annotation.DefaultInstallAnnotations...),
			reconciler.WithUpgradeAnnotations(annotation.DefaultUpgradeAnnotations...),
			reconciler.WithUninstallAnnotations(annotation.DefaultUninstallAnnotations...),
		)
...

...
// Setup manager with Go API
   if err = (&controllers.MemcachedBackupReconciler{
		client: mgr.Getclient(),
		Scheme: mgr.GetScheme(),
	}).SetupWithManager(mgr); err != nil {
		setupLog.Error(err, "unable to create controller", "controller", "MemcachedBackup")
		os.Exit(1)
	}

   ...
// Setup manager with Helm API
	for _, w := range ws {

      ...
		if err := r.SetupWithManager(mgr); err != nil {
			setupLog.Error(err, "unable to create controller", "controller", "Helm")
			os.Exit(1)
		}
		setupLog.Info("configured watch", "gvk", w.GroupVersionKind, "chartPath", w.ChartPath, "maxConcurrentReconciles", maxConcurrentReconciles, "reconcilePeriod", reconcilePeriod)
	}

// Start the manager
   if err := mgr.Start(ctrl.SetupSignalHandler()); err != nil {
		setupLog.Error(err, "problem running manager")
		os.Exit(1)
	}

---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
  name: manager-role
rules:
- apiGroups:
  - ""
  resources:
  - namespaces
  verbs:
  - get
- apiGroups:
  - apps
  resources:
  - deployments
  - daemonsets
  - replicasets
  - statefulsets
  verbs:
  - create
  - delete
  - get
  - list
  - patch
  - update
  - watch
- apiGroups:
  - cache.my.domain
  resources:
  - memcachedbackups
  verbs:
  - create
  - delete
  - get
  - list
  - patch
  - update
  - watch
- apiGroups:
  - cache.my.domain
  resources:
  - memcachedbackups/finalizers
  verbs:
  - create
  - delete
  - get
  - list
  - patch
  - update
  - watch
- apiGroups:
  - ""
  resources:
  - pods
  - services
  - services/finalizers
  - endpoints
  - persistentvolumeclaims
  - events
  - configmaps
  - secrets
  - serviceaccounts
  verbs:
  - create
  - delete
  - get
  - list
  - patch
  - update
  - watch
- apiGroups:
  - cache.my.domain
  resources:
  - memcachedbackups/status
  verbs:
  - get
  - patch
  - update
- apiGroups:
  - policy
  resources:
  - events
  - poddisruptionbudgets
  verbs:
  - create
  - delete
  - get
  - list
  - patch
  - update
  - watch
- apiGroups:
  - cache.my.domain
  resources:
  - memcacheds
  - memcacheds/status
  - memcacheds/finalizers
  verbs:
  - create
  - delete
  - get
  - list
  - patch
  - update
  - watch