fix: fetch account key for NFS when createFolderIfNotExist is set

When using NFS protocol with createFolderIfNotExist and folderName,
GetAccountInfo previously returned early without fetching the account
key. This caused createFolderIfNotExists to silently fail because
newAzureFileClient requires the account key for data plane operations.

Fix: Skip the NFS early-return in GetAccountInfo when both
createFolderIfNotExist=true and folderName is set, so the account
key is retrieved and the data plane API can create the folder.

Fixes: #3041

Author: andyzhangx

pkg/azurefile/azurefile.go

@@ -880,7 +880,21 @@ func (d *Driver) GetAccountInfo(ctx context.Context, volumeID string, secrets, r
 	}
 	if protocol == nfs && fileShareName != "" {
 		// nfs protocol does not need account key, return directly
-		return rgName, accountName, accountKey, fileShareName, diskName, subsID, tenantID, tokenFilePath, err
+		// unless createFolderIfNotExist is set with a folderName, which requires account key for data plane API
+		var needAccountKey bool
+		var hasFolder bool
+		for k, v := range reqContext {
+			switch strings.ToLower(k) {
+			case createFolderIfNotExistField:
+				needAccountKey = strings.EqualFold(v, trueValue)
+			case folderNameField:
+				hasFolder = v != ""
+			}
+		}
+		if !needAccountKey || !hasFolder {
+			return rgName, accountName, accountKey, fileShareName, diskName, subsID, tenantID, tokenFilePath, err
+		}
+		klog.V(2).Infof("NFS protocol with createFolderIfNotExist, fetching account key for data plane API")
 	}
 
 	if secretNamespace == "" {