set S-waiting-on labels on new PRs

Author: RalfJung

src/tools/miri/triagebot.toml

@@ -44,6 +44,12 @@ remove = []
 add = ["S-waiting-on-author"]
 unless = ["S-blocked", "S-waiting-on-team", "S-waiting-on-review"]
 
+[autolabel."S-waiting-on-review"]
+new_pr = true
+
+[autolabel."S-waiting-on-author"]
+new_draft = true
+
 # Automatically close and reopen PRs made by bots to run CI on them
 [bot-pull-requests]