docs: Add source_file as new argument

Signed-off-by: Ruihua Wen <[email protected]>

docs/resources/storage_bucket.md

@@ -16,6 +16,16 @@ resource "incus_storage_bucket" "bucket1" {
 }
 ```
 
+## Example to create bucket from backup file 
+
+```hcl
+resource "incus_storage_bucket" "bucket_from_backup" {
+ name        = "restored-bucket"
+ pool        = "default"
+ source_file = "/path/to/backup.tar.gz"
+}
+```
+
 ## Argument Reference
 
 * `name` - **Required** - Name of the storage bucket.
@@ -35,6 +45,8 @@ resource "incus_storage_bucket" "bucket1" {
 
 * `target` - *Optional* - Specify a target node in a cluster.
 
+* `source_file` - *Optional* - Path to a backup file from which the bucket will be created.
+
 
 ## Attribute Reference