add username property

docs/docs/lock-stores.mdx

@@ -156,6 +156,8 @@ The `ConcurrentRedisLockStore` recreates the `TicketLock` from the persisted `Ti
   - `key_prefix` (default: `None`): The prefix to prepend to lock store keys. Must
     be alphanumeric
 
+  -  `username` (default: `None`): Username used for authentication
+
   - `password` (default: `None`): Password used for authentication
     (`None` equals no authentication)
 

rasa/core/lock_store.py

@@ -200,6 +200,7 @@ def __init__(
         host: Text = "localhost",
         port: int = 6379,
         db: int = 1,
+        username: Optional[Text] = None,
         password: Optional[Text] = None,
         use_ssl: bool = False,
         ssl_certfile: Optional[Text] = None,
@@ -215,6 +216,8 @@ def __init__(
             port: The port of the redis server.
             db: The name of the database within Redis which should be used by Rasa
                 Open Source.
+            username: The username which should be used for authentication with the
+                Redis database.
             password: The password which should be used for authentication with the
                 Redis database.
             use_ssl: `True` if SSL should be used for the connection to Redis.
@@ -232,6 +235,7 @@ def __init__(
             host=host,
             port=int(port),
             db=int(db),
+            username=username,
             password=password,
             ssl=use_ssl,
             ssl_certfile=ssl_certfile,