CI - moonpeak docs

Run moonpeak tests in GitHub Actions.

# .github/workflows/test.yml
name: test
on: [push, pull_request]
jobs:
  test:
    runs-on: ubuntu-24.04
    steps:
      - uses: actions/checkout@v5
      - uses: actions/setup-node@v5
        with: { node-version: 22, cache: npm }
      - run: npm ci
      - run: npx moonpeak test
      - run: npx playwright install --with-deps chromium
      - run: npx moonpeak test --e2e

For a server in another language, start it in the background first, then point --server at it.

Pin ubuntu-24.04: Playwright's --with-deps installs system packages and only supports the Ubuntu versions it knows. Run --eval in a separate, manually triggered workflow with your provider keys as secrets.