ci: auto-sync prompt artifacts from upstream prompts.yml

[justin808]

What

A scheduled GitHub Actions bot that regenerates the committed prompt artifacts from react_on_rails prompts.yml and opens a PR when they drift — mirroring react_on_rails' own update-llms-full.yml.

Why

The site build runs prepare:prompts, which regenerates prompts.ts / prompts.json / prompts/llms.txt from upstream prompts.yml and fails on drift (scripts/prepare-prompts.mjs). Those files are committed, so whenever upstream prompts.yml changes (e.g. shakacode/react_on_rails#4232) they go stale and every PR turns red until someone regenerates by hand — exactly what just happened on #136. This keeps them fresh automatically.

How

• Triggers: daily schedule, workflow_dispatch, and the docs-updated repository_dispatch react_on_rails already sends to this repo.
• npm run prepare ephemeral-clones react_on_rails main (via REACT_ON_RAILS_REPO_URL/REF, same as the build job) and regenerates.
• Opens a PR scoped to just the 3 prompt artifacts (add-paths); the change-detection is also scoped to those 3 files.

Notes for the maintainer

• Requires Settings → Actions → "Allow GitHub Actions to create and approve pull requests" (same as react_on_rails uses for its llms-full bot).
• PRs opened by GITHUB_TOKEN don't auto-trigger the build check; review the small generated diff and merge (or enable auto-merge). I can add a check-dispatch step if you'd prefer it fully hands-off.

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 7afce601-a442-4c22-9a8e-926dfd517d51

📥 Commits

Reviewing files that changed from the base of the PR and between e0461a4 and fd8e300.

📒 Files selected for processing (1)

• .github/workflows/sync-upstream-prompts.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch jg/ci-sync-prompt-artifacts

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[greptile-apps]

Greptile Summary

This PR adds an automated prompt artifact sync workflow. The main changes are:

• A daily, manual, and docs-updated dispatch trigger.
• A Node 24 prepare run against react_on_rails main.
• Scoped change detection and bot PR creation for the three prompt artifacts.

Confidence Score: 5/5

This looks safe to merge.

• No blocking issues found in the changed code.

Important Files Changed

Filename	Overview
.github/workflows/sync-upstream-prompts.yml	Adds the GitHub Actions workflow that regenerates prompt artifacts and opens a scoped bot PR when they drift.

_{Reviews (1): Last reviewed commit: "ci: add bot to sync prompt artifacts fro..." | Re-trigger Greptile}

[github-actions]

Cloudflare preview deployed.

• Branch: pr-137
• URL: https://80af4578.reactonrails-com.pages.dev