fix Slack #members auth

app/slack.py

@@ -75,7 +75,7 @@ def authz_special(authzGroup, userGroups, user) -> Tuple[bool, str]:
 def slack_authz(user_id: str, channel_id: str, door: str) -> Tuple[bool, str]:
     if door in ["alldoors", "backdoor", "frontdoor", "grounddoor"]:
         if channel_id == SLACK_CHANNEL_ID:
-            return True
+            return True, "Anonymous #members user 🖕"
 
         groups, user = kube.by_slackid(user_id)
         if "k-space:floor" not in groups: