add label variable interpolation in hook context

borgmatic/commands/borgmatic.py

@@ -283,9 +283,14 @@ def run_actions(
     '''
     add_custom_log_levels()
     repository_path = os.path.expanduser(repository['path'])
+    if 'label' in repository:
+        repository_label = repository['label']
+    else:
+        repository_label = ''
     global_arguments = arguments['global']
     dry_run_label = ' (dry run; not making any changes)' if global_arguments.dry_run else ''
     hook_context = {
+        'label': repository_label,
         'repository': repository_path,
         # Deprecated: For backwards compatibility with borgmatic < 1.6.0.
         'repositories': ','.join([repo['path'] for repo in config['repositories']]),