reference.md

devlearn-devops — reference

GitHub Actions minimal CI

name: CI
on:
  push:
    branches: [main]
  pull_request:

jobs:
  test:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - uses: actions/setup-node@v4
        with:
          node-version: '20'
          cache: npm
      - run: npm ci
      - run: npm test
      - run: npm run build

Secrets in Actions

env:
  API_KEY: ${{ secrets.API_KEY }}

Teach: Settings → Secrets, never commit values.

Dockerfile sketch (Node API)

FROM node:20-alpine
WORKDIR /app
COPY package*.json ./
RUN npm ci --omit=dev
COPY . .
EXPOSE 3000
CMD ["node", "server.js"]

Terms: image (recipe result), container (running instance).

Branch protection (concept)

Require CI green before merge — teach on GitHub/GitLab when user uses PRs.

Pipeline stages table

Stage	Catches
lint	style, some bugs
test	logic regressions
build	compile/bundle errors
audit	known vuln deps
deploy	only if all green

Links

• GitHub Actions docs