storage/v2: disk preserve also

subiquity/common/filesystem/labels.py

@@ -265,6 +265,7 @@ def _for_client_disk(disk, *, min_size=0):
         path=path,
         type=desc(disk),
         size=disk.size,
+        preserve=disk.preserve,
         usage_labels=usage_labels(disk),
         partitions=[for_client(p) for p in disk._partitions],
         free_for_partitions=disk.free_for_partitions,

subiquity/common/types.py

@@ -262,6 +262,7 @@ class Disk:
     type: Optional[str]
     size: int
     ok_for_guided: Optional[bool]
+    preserve: Optional[bool] = None
     path: Optional[str] = None
     free_for_partitions: Optional[int] = 0
     usage_labels: Optional[List[str]] = []