fix(server): Handle boot bolume correctly (#749)

* fix(server): Handle boot bolume correctly

- Display id and delete_on_termination in datasource
- Handle id and delete_on_termination in resource

Signed-off-by: Alexander Dahmen <alexander.dahmen@inovex.de>

* fixup

Signed-off-by: Alexander Dahmen <alexander.dahmen@inovex.de>

---------

Signed-off-by: Alexander Dahmen <alexander.dahmen@inovex.de>

docs/resources/server.md

@@ -410,3 +410,7 @@ Optional:
 - `delete_on_termination` (Boolean) Delete the volume during the termination of the server. Only allowed when `source_type` is `image`.
 - `performance_class` (String) The performance class of the server.
 - `size` (Number) The size of the boot volume in GB. Must be provided when `source_type` is `image`.
+
+Read-Only:
+
+- `id` (String) The ID of the boot volume

docs/resources/server_backup_schedule.md

@@ -62,5 +62,3 @@ Required:
 Optional:
 
 - `volume_ids` (List of String)
-
-