Pre-work for enabling GitHub merge queue on the staging branch (#TBD
follow-up issue). Without these triggers, the queue's pre-merge CI run
on the speculative `gh-readonly-queue/...` ref would never fire, every
queued PR would show false-green for the required checks, and queue
would merge things that don't actually pass on the rebased commit.
Adding the trigger now is **a no-op** — the `merge_group` event only
fires once the queue is enabled on a branch, which is a separate UI/API
toggle. So this PR is safe to land in isolation; merge-queue enablement
is the next step and reversible at the branch-protection level.
Why these two workflows:
- `ci.yml` provides 5 of the 8 required staging checks (Detect changes,
Platform Go, Canvas Next.js, Python Lint & Test, Shellcheck E2E)
- `codeql.yml` provides the other 3 (Analyze go / js-ts / python)
Other workflows (e2e-staging-*, canary-*, publish-*) are not required
status checks and don't need the trigger to keep the queue working.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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