ci: maintain workflows and keep Supabase active

[ZL-Asica]

✨ Features Updates

📌 Description

This PR trims repeated GitHub Actions setup code and adds a scheduled Supabase keep-alive workflow.

🔍 Feature Changes

• Other: add a twice-weekly Keep Supabase Alive workflow with manual dispatch support.

🔄 Refactor Changes

• Improve maintainability
• Remove unnecessary code
• Other: reuse one local Node/pnpm setup action across CI workflows.

🛠 Bug Fixes

• Other: reduce the risk of Supabase inactivity pauses.

✅ Checklist

1. Feature Updates:

• Code follows project coding style.
• Tested in the TanStack Start + Vite environment.

3. Code Refactor:

• No breaking changes introduced.

💬 Additional Notes

• The keep-alive job uses VITE_SUPABASE_URL and SUPABASE_SECRET_KEY to ping profile?select=id&limit=1.
• No dependency changes.

✅ Validation

• pnpm run lint:ci
• Ruby YAML parse check for changed workflow/action files
• Push hook: eslint . --fix
• Push hook: pnpm run test:unit && pnpm run test:e2e
• Push hook: vite build

[github-actions]

🌐 Pair Research PR Preview

• 🚀 Preview deploy: ✅ success
• 🔗 Preview URL: (not available)

🔗 Run: https://github.com/NUDelta/pair-research/actions/runs/26720953558

[github-actions]

🧪 Pair Research PR Checks

• 🚨 Lint: ✅ success

• 🧪 Unit tests: ✅ success

• 🎭 E2E tests: ✅ success

• 🏗️ Build: ✅ success

• ▶️ E2E executed: 6 / 9

• ✅ E2E passed: 6

• ❌ E2E failed: 0

• ⏭️ E2E skipped: 3

🔗 Run: https://github.com/NUDelta/pair-research/actions/runs/26720953574

[Copilot]

Pull request overview

This PR refactors GitHub Actions workflows to reuse a local composite action for Node/pnpm setup and introduces a scheduled workflow to ping Supabase to reduce inactivity pauses.

Changes:

• Replace repeated Node + pnpm setup/install steps across CI workflows with a shared local composite action.
• Add a scheduled + manually-dispatchable “Keep Supabase Alive” workflow that pings the Supabase REST API.
• Apply the shared setup action to PR preview, PR checks, and production deploy workflows.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
.github/workflows/pr-preview.yml	Swaps duplicated Node/pnpm setup steps for the shared composite action.
.github/workflows/pr-checks.yml	Uses the shared composite action across lint/unit/e2e/build jobs.
.github/workflows/keep-supabase-alive.yml	Adds scheduled/manual Supabase REST ping job to keep the project active.
.github/workflows/deploy-production.yml	Reuses the shared composite action for production deploy pipeline setup.
.github/actions/setup-node-pnpm/action.yml	Introduces a composite action encapsulating pnpm + Node setup and dependency install.

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