[cozystack-controller] cozy controller fix system reconcilations (#1205)

<!-- Thank you for making a contribution! Here are some tips for you:
- Start the PR title with the [label] of Cozystack component:
- For system components: [platform], [system], [linstor], [cilium],
[kube-ovn], [dashboard], [cluster-api], etc.
- For managed apps: [apps], [tenant], [kubernetes], [postgres],
[virtual-machine] etc.
- For development and maintenance: [tests], [ci], [docs], [maintenance].
- If it's a work in progress, consider creating this PR as a draft.
- Don't hesistate to ask for opinion and review in the community chats,
even if it's still a draft.
- Add the label `backport` if it's a bugfix that needs to be backported
to a previous version.
-->

## What this PR does


### Release note

<!--  Write a release note:
- Explain what has changed internally and for users.
- Start with the same [label] as in the PR title
- Follow the guidelines at
https://github.com/kubernetes/community/blob/master/contributors/guide/release-notes.md.
-->

```release-note
- fix system reconcilations
```

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

* **Bug Fixes**
* Improved reliability when updating HelmRelease objects to prevent
unintended changes during reconciliation.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

internal/controller/system_helm_reconciler.go

@@ -54,6 +54,7 @@ func (r *CozystackConfigReconciler) Reconcile(ctx context.Context, _ ctrl.Reques
 		if !isSystemApp && !isTenantRoot {
 			continue
 		}
+		patchTarget := hr.DeepCopy()
 
 		if hr.Annotations == nil {
 			hr.Annotations = map[string]string{}
@@ -62,13 +63,12 @@ func (r *CozystackConfigReconciler) Reconcile(ctx context.Context, _ ctrl.Reques
 		if hr.Annotations[digestAnnotation] == digest {
 			continue
 		}
+		patchTarget.Annotations[digestAnnotation] = digest
+		patchTarget.Annotations[forceReconcileKey] = now
+		patchTarget.Annotations[requestedAt] = now
 
 		patch := client.MergeFrom(hr.DeepCopy())
-		hr.Annotations[digestAnnotation] = digest
-		hr.Annotations[forceReconcileKey] = now
-		hr.Annotations[requestedAt] = now
-
-		if err := r.Patch(ctx, &hr, patch); err != nil {
+		if err := r.Patch(ctx, patchTarget, patch); err != nil {
 			log.Error(err, "failed to patch HelmRelease", "name", hr.Name, "namespace", hr.Namespace)
 			continue
 		}