ci: bisect workflow also triggers on push to bisect branch

workflow_dispatch alone requires the workflow file to be on the default
branch (main) before GitHub registers it. Adding push: branches:[this-branch]
paths:[this-file] makes the workflow self-bootstrap — pushing the workflow
to this branch fires it once. Path filter prevents subsequent unrelated
pushes from re-running it.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: backspace

.github/workflows/bisect-cs-10966.yaml

@@ -12,6 +12,11 @@ name: Bisect CS-10966
 
 on:
   workflow_dispatch:
+  push:
+    branches:
+      - rri-widen-relativeTo-cs-10966
+    paths:
+      - .github/workflows/bisect-cs-10966.yaml
 
 permissions:
   contents: read