replace predefined ssh keys with generated ones

bundles/backup-server/items.py

@@ -27,9 +27,6 @@ directories['/etc/backup-server/clients'] = {
 sudoers = {}
 
 for nodename, config in node.metadata.get('backup-server/clients', {}).items():
-    with open(join(repo.path, 'data', 'backup', 'keys', f'{nodename}.pub'), 'r') as f:
-        pubkey = f.read().strip()
-
     sudoers[config['user']] = nodename
 
     users[config['user']] = {
@@ -41,7 +38,10 @@ for nodename, config in node.metadata.get('backup-server/clients', {}).items():
     }
 
     files[f'/srv/backups/{nodename}/.ssh/authorized_keys'] = {
-        'content': pubkey,
+        'content': repo.libs.ssh.generate_ed25519_public_key(
+            config['user'],
+            node,
+        ),
         'owner': config['user'],
         'mode': '0400',
         'needs': {