In some environments the export server might lack permissions to handle files that aren't created by Kubevirt or CDI, such as the lost+found directory.

When that happens, export fails with

{"component":"virt-exportserver-virt-export-example-export","level":"info","msg":"Starting export server","pos":"virt-exportserver.go:40","timestamp":"2025-04-16T01:25:28.213894Z"}
{"component":"virt-exportserver-virt-export-example-export","level":"error","msg":"/export-volumes/test/lost+found may lack read permissions","pos":"exportserver.go:519","reason":"open /export-volumes/test/lost+found: permission denied","timestamp":"2025-04-16T01:25:28.214832Z"}
{"component":"virt-exportserver-virt-export-example-export","level":"info","msg":"unable to manipulate /export-volumes/test's contents, exiting\n","pos":"exportserver.go:127","timestamp":"2025-04-16T01:25:28.214880Z"}

We should exclude files not handled by Kubevirt (or CDI) to avoid this issue.

4.19

Always

1. Create VM using storage with restricted permissions for non-kubevirt files
2. Create export 
3. Export fails

Export server fails with lack of permissions

The export server should exclude non-kubevirt files such as lost+found