Add option to log in to custom puppet with shared secret

example-config.yaml

@@ -154,6 +154,12 @@ bridge:
     # Whether or not to use /sync to get presence, read receipts and typing notifications when using
     # your own Matrix account as the Matrix puppet for your Telegram account.
     sync_with_custom_puppets: true
+    # Shared secret for https://github.com/devture/matrix-synapse-shared-secret-auth
+    #
+    # If set, custom puppets will be enabled automatically for local users
+    # instead of users having to find an access token and run `login-matrix`
+    # manually.
+    login_shared_secret: null
     # Set to false to disable link previews in messages sent to Telegram.
     telegram_link_preview: true
     # Use inline images instead of a separate message for the caption.