debug: trigger gdb workflow on push to this branch

Co-Authored-By: Claude <noreply@anthropic.com>

Author: HumanBean17

.github/workflows/debug-segfault.yml

@@ -6,7 +6,8 @@ name: debug-segfault
 # x86_64 (not on macOS Docker), so we run under gdb here. Delete this file once
 # the root cause is found.
 on:
-  workflow_dispatch:
+  push:
+    branches: [debug/segfault-gdb]
 
 jobs:
   gdb: