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devlearn-devops — examples

Annotated CI workflow

on:
  pull_request:    # run on every PR — teach: catch bugs before merge
jobs:
  test:
    runs-on: ubuntu-latest  # clean Linux VM each time
    steps:
      - uses: actions/checkout@v4  # get your code
      - run: npm ci               # install exact lockfile versions
      - run: npm test             # gate: fail job if tests fail

Lesson hook: Failed CI on PR = merge blocked until fixed (if branch protection on).

Preview deploy (Vercel/Netlify concept)

Push to PR branch → platform gives preview URL → /devlearn-pre-ship uses that URL for staging check.

CI vs CD one sentence

CI answers "is this commit safe to merge?" CD answers "merge passed — put it live."