gitrepo: Ignore patch error not found on delete

While deleting, patching an object with new status results in "not
found" error because the object is already deleted. The patching
operation first patches the status conditions, the rest of the object
and, at the very end, the rest of the status. When an object is
deleted, the garbage collection results in the artifact in the status
to be updated, resulting in a diff that is attempted to be patched
when the deferred patch runs.
Since the status patching runs at the very end, the object gets deleted
before it can be patched.
Ignore "not found" error while patching when the delete timestamp is
set.

Signed-off-by: Sunny <darkowlzz@protonmail.com>

controllers/gitrepository_controller.go

@@ -25,6 +25,7 @@ import (
 
 	securejoin "github.com/cyphar/filepath-securejoin"
 	corev1 "k8s.io/api/core/v1"
+	apierrors "k8s.io/apimachinery/pkg/api/errors"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/types"
 	kerrors "k8s.io/apimachinery/pkg/util/errors"
@@ -172,6 +173,10 @@ func (r *GitRepositoryReconciler) Reconcile(ctx context.Context, req ctrl.Reques
 
 		// Finally, patch the resource
 		if err := patchHelper.Patch(ctx, obj, patchOpts...); err != nil {
+			// Ignore patch error "not found" when the object is being deleted.
+			if !obj.ObjectMeta.DeletionTimestamp.IsZero() {
+				err = kerrors.FilterOut(err, func(e error) bool { return apierrors.IsNotFound(e) })
+			}
 			retErr = kerrors.NewAggregate([]error{retErr, err})
 		}