fix: setup logger for custom curtinhook

ubuntu/scripts/curtin-hooks

@@ -25,7 +25,7 @@ import platform
 
 from curtin import distro, util
 from curtin.config import load_command_config
-from curtin.log import LOG
+from curtin.log import DEBUG, LOG, basicConfig
 from curtin.paths import target_path
 from curtin.util import load_command_environment, ChrootableTarget
 from curtin.commands import curthooks, apt_config
@@ -103,6 +103,8 @@ def main():
     config = load_command_config(None, state)
     target = state['target']
 
+    basicConfig(stream=sys.stderr, verbosity=DEBUG)
+
     curthook(config, target, state)
     cleanup()