Fix string comparison on not found resources

This converts the errors to the correct types and then checks if the
resources are actually not found.

Signed-off-by: Sascha Grunert <sgrunert@redhat.com>

internal/pkg/manager/spod/bindata/ca.go

@@ -18,18 +18,20 @@ package bindata
 
 import (
 	"context"
+	"errors"
 	"fmt"
 	"strings"
 
 	certmanagerv1 "github.com/cert-manager/cert-manager/pkg/apis/certmanager/v1"
 	certmanagermetav1 "github.com/cert-manager/cert-manager/pkg/apis/meta/v1"
 	"github.com/go-logr/logr"
 	configv1 "github.com/openshift/api/config/v1"
-	"k8s.io/apimachinery/pkg/api/errors"
+	apierrors "k8s.io/apimachinery/pkg/api/errors"
 	"k8s.io/apimachinery/pkg/api/meta"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/runtime"
 	"k8s.io/apimachinery/pkg/types"
+	"k8s.io/client-go/discovery"
 	"sigs.k8s.io/controller-runtime/pkg/client"
 
 	"sigs.k8s.io/security-profiles-operator/internal/pkg/config"
@@ -69,14 +71,24 @@ func GetCAInjectType(
 func IsNotFound(err error) bool {
 	if runtime.IsNotRegisteredError(err) ||
 		meta.IsNoMatchError(err) ||
-		errors.IsNotFound(err) {
+		apierrors.IsNotFound(err) {
 		return true
 	}
 
+	// Introduced in controller-runtime v0.15.0, which makes a simple
+	// `apierrors.IsNotFound(err)` not work any more.
+	groupErr := &discovery.ErrGroupDiscoveryFailed{}
+	if errors.As(err, &groupErr) {
+		for _, err := range groupErr.Groups {
+			if apierrors.IsNotFound(err) {
+				return true
+			}
+		}
+	}
+
 	// Fallback
 	for _, msg := range []string{
 		"failed to get restmapping",
-		"could not find the requested resource",
 	} {
 		if strings.Contains(err.Error(), msg) {
 			return true
@@ -116,7 +128,7 @@ func GetCertManagerResources(namespace string) *CertManagerResources {
 func (c *CertManagerResources) Create(ctx context.Context, cl client.Client) error {
 	for k, o := range c.objectMap() {
 		if err := cl.Create(ctx, o); err != nil {
-			if errors.IsAlreadyExists(err) {
+			if apierrors.IsAlreadyExists(err) {
 				continue
 			}
 			return fmt.Errorf("creating %s: %w", k, err)