Treat artifact registry as gcr.io registry

If the Workload Identity is set up correctly and the role for artifact
registry is assigned (roles/artifactregistry.reader) artifact registry
also works. 👍

Signed-off-by: Kingdon Barrett <kingdon@weave.works>

controllers/imagerepository_controller.go

@@ -733,5 +733,5 @@ func hostIsAzureContainerRegistry(host string) bool {
 }
 
 func hostIsGoogleContainerRegistry(host string) bool {
-	return host == "gcr.io" || strings.HasSuffix(host, ".gcr.io")
+	return host == "gcr.io" || strings.HasSuffix(host, ".gcr.io") || strings.HasSuffix(host, "-docker.pkg.dev")
 }