## Summary
Dispatch a `frontend-asset-build` event to the cloud repo when the
`preview` label is added to a PR, so cloud can build preview assets.
## Changes
- **What**: Extended `cloud-dispatch-build.yaml` to trigger on
`pull_request` `labeled` events filtered to the `preview` label. The
payload sends the PR head SHA and branch.
## Review Focus
- The `pull_request` trigger gives a read-only `GITHUB_TOKEN`, but the
dispatch step uses `CLOUD_DISPATCH_TOKEN` so this is fine.
- Fork PRs are blocked by the existing `github.repository` guard.
┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-9518-feat-dispatch-cloud-build-when-preview-label-is-added-to-PR-31c6d73d365081a8aab6f585960977f6)
by [Unito](https://www.unito.io)
## Summary
Adds `.github/workflows/cloud-dispatch-build.yaml` — fires a
`repository_dispatch` event (`frontend-asset-build`) to
`Comfy-Org/cloud` on push to `cloud/*` branches and `main`.
The cloud repo handles the actual build, GCS upload, and secret
management (Sentry, Algolia, GCS creds). This is fire-and-forget.
## Changes
- New workflow: `cloud-dispatch-build.yaml`
- Trigger: `push` to `cloud/*` and `main` only
- Payload: `ref` (commit SHA) + `branch` (branch name), built with `jq`
to prevent injection
- SHA-pinned `peter-evans/repository-dispatch@v4.0.1`
- Hardened: `permissions: {}`, fork guard (`if: github.repository ==
'Comfy-Org/ComfyUI_frontend'`), concurrency to avoid dispatch storms
- `cloud-deploy-frontend.yaml` left unchanged (still needed during
migration)
## Setup Required
A repository secret `CLOUD_DISPATCH_TOKEN` must be configured — see PR
description comments.
## Part of
Frontend separate deploy prep (Task 1.3)
┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-9308-feat-add-cloud-frontend-build-dispatch-workflow-3156d73d36508164a515eb968f6c5d79)
by [Unito](https://www.unito.io)
