bot-postmoogle: add POSTMOOGLE_USERS config option

roles/matrix-bot-postmoogle/defaults/main.yml

@@ -84,6 +84,15 @@ matrix_bot_postmoogle_noowner: false
 # Allow Postmoogle use by users over federation
 matrix_bot_postmoogle_federation: false
 
+# A list of whitelisted users allowed to use the bridge.
+# If not defined, everyone is allowed.
+# Example set of rules:
+# - @someone:example.com
+# - @another:example.com
+# - @bot.*:example.com
+# - @*:another.com
+matrix_bot_postmoogle_users: []
+
 # Sentry DSN
 matrix_bot_postmoogle_sentry: ''