Fix CNIEnv concurrency isse on NetworkByNameOrID

Signed-off-by: apostasie <spam_blackhole@farcloser.world>

Author: apostasie

pkg/netutil/netutil.go

@@ -243,10 +243,14 @@ func (e *CNIEnv) NetworkMap() (map[string]*NetworkConfig, error) { //nolint:revi
 }
 
 func (e *CNIEnv) NetworkByNameOrID(key string) (*NetworkConfig, error) {
-	networks, err := e.networkConfigList()
-	if err != nil {
-		return nil, err
+	var networks []*NetworkConfig
+	var err error
+
+	fn := func() error {
+		networks, err = e.networkConfigList()
+		return err
 	}
+	err = lockutil.WithDirLock(filepath.Join(e.NetconfPath, ".nerdctl.lock"), fn)
 
 	for _, n := range networks {
 		if n.Name == key {