Post {beta,stable}-accepted message to bootstrap backport threads

Author: jieyouxu

triagebot.toml

@@ -764,6 +764,13 @@ don't know
 ]
 message_on_remove = "PR #{number}'s beta-nomination has been removed."
 
+[notify-zulip."beta-accepted".bootstrap]
+required_labels = ["T-bootstrap"]
+zulip_stream = 507486 # #t-infra/bootstrap/backports
+# Put it in the same thread as beta-nominated.
+topic = "#{number}: beta-nominated"
+message_on_add = "PR #{number} has been **accepted** for **beta** backport."
+
 [notify-zulip."stable-nominated".bootstrap]
 required_labels = ["T-bootstrap"]
 zulip_stream = 507486 # #t-infra/bootstrap/backports
@@ -782,6 +789,13 @@ don't know
 ]
 message_on_remove = "PR #{number}'s stable-nomination has been removed."
 
+[notify-zulip."stable-accepted".bootstrap]
+required_labels = ["T-bootstrap"]
+zulip_stream = 507486 # #t-infra/bootstrap/backports
+# Put it in the same thread as stable-nominated.
+topic = "#{number}: stable-nominated"
+message_on_add = "PR #{number} has been **accepted** for **stable** backport."
+
 
 [notify-zulip."A-edition-2021"]
 required_labels = ["C-bug"]