cicd-expert

What this skill does

# CI/CD Expert

Expert guidance for Continuous Integration and Continuous Deployment, including GitHub Actions, Jenkins, GitLab CI, deployment strategies, and automation best practices.

## Core Concepts

### CI/CD Fundamentals
- Continuous Integration (CI)
- Continuous Delivery vs Deployment
- Build automation
- Test automation
- Artifact management
- Deployment strategies (blue-green, canary, rolling)

### Pipeline Design
- Pipeline stages and jobs
- Parallel execution
- Dependencies and artifacts
- Caching strategies
- Matrix builds
- Conditional execution

### Security
- Secret management
- Dependency scanning
- SAST/DAST
- Container scanning
- Supply chain security
- SBOM generation

## GitHub Actions

### Workflow Basics
```yaml
# .github/workflows/ci.yml
name: CI

on:
  push:
    branches: [main, develop]
  pull_request:
    branches: [main]
  workflow_dispatch:

env:
  NODE_VERSION: '20'
  DOCKER_REGISTRY: ghcr.io

jobs:
  test:
    name: Test
    runs-on: ubuntu-latest

    strategy:
      matrix:
        node-version: [18, 20, 21]

    steps:
      - name: Checkout code
        uses: actions/checkout@v4
        with:
          fetch-depth: 0  # Full history for SonarCloud

      - name: Setup Node.js ${{ matrix.node-version }}
        uses: actions/setup-node@v4
        with:
          node-version: ${{ matrix.node-version }}
          cache: 'npm'

      - name: Install dependencies
        run: npm ci

      - name: Run linting
        run: npm run lint

      - name: Run tests
        run: npm test -- --coverage

      - name: Upload coverage
        uses: codecov/codecov-action@v3
        with:
          token: ${{ secrets.CODECOV_TOKEN }}
          files: ./coverage/coverage-final.json

  build:
    name: Build
    runs-on: ubuntu-latest
    needs: test

    steps:
      - uses: actions/checkout@v4

      - uses: actions/setup-node@v4
        with:
          node-version: ${{ env.NODE_VERSION }}
          cache: 'npm'

      - run: npm ci
      - run: npm run build

      - name: Upload build artifacts
        uses: actions/upload-artifact@v3
        with:
          name: build
          path: dist/
          retention-days: 7

  security:
    name: Security Scan
    runs-on: ubuntu-latest

    steps:
      - uses: actions/checkout@v4

      - name: Run Trivy vulnerability scanner
        uses: aquasecurity/trivy-action@master
        with:
          scan-type: 'fs'
          scan-ref: '.'
          format: 'sarif'
          output: 'trivy-results.sarif'

      - name: Upload Trivy results to GitHub Security
        uses: github/codeql-action/upload-sarif@v2
        with:
          sarif_file: 'trivy-results.sarif'

      - name: Run npm audit
        run: npm audit --audit-level=high
```

### Docker Build and Push
```yaml
# .github/workflows/docker.yml
name: Docker Build and Push

on:
  push:
    branches: [main]
    tags: ['v*']

env:
  REGISTRY: ghcr.io
  IMAGE_NAME: ${{ github.repository }}

jobs:
  build-and-push:
    runs-on: ubuntu-latest
    permissions:
      contents: read
      packages: write

    steps:
      - name: Checkout
        uses: actions/checkout@v4

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v3

      - name: Log in to Container Registry
        uses: docker/login-action@v3
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Extract metadata
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
          tags: |
            type=ref,event=branch
            type=ref,event=pr
            type=semver,pattern={{version}}
            type=semver,pattern={{major}}.{{minor}}
            type=sha,prefix={{branch}}-

      - name: Build and push
        uses: docker/build-push-action@v5
        with:
          context: .
          push: true
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}
          cache-from: type=gha
          cache-to: type=gha,mode=max
          platforms: linux/amd64,linux/arm64
```

### Deployment Workflow
```yaml
# .github/workflows/deploy.yml
name: Deploy to Production

on:
  push:
    tags: ['v*']
  workflow_dispatch:
    inputs:
      environment:
        description: 'Environment to deploy to'
        required: true
        type: choice
        options:
          - staging
          - production

jobs:
  deploy:
    name: Deploy to ${{ inputs.environment || 'production' }}
    runs-on: ubuntu-latest
    environment:
      name: ${{ inputs.environment || 'production' }}
      url: https://${{ inputs.environment || 'production' }}.example.com

    steps:
      - uses: actions/checkout@v4

      - name: Configure AWS credentials
        uses: aws-actions/configure-aws-credentials@v4
        with:
          aws-access-key-id: ${{ secrets.AWS_ACCESS_KEY_ID }}
          aws-secret-access-key: ${{ secrets.AWS_SECRET_ACCESS_KEY }}
          aws-region: us-east-1

      - name: Deploy to ECS
        run: |
          aws ecs update-service \
            --cluster ${{ secrets.ECS_CLUSTER }} \
            --service ${{ secrets.ECS_SERVICE }} \
            --force-new-deployment

      - name: Wait for deployment
        run: |
          aws ecs wait services-stable \
            --cluster ${{ secrets.ECS_CLUSTER }} \
            --services ${{ secrets.ECS_SERVICE }}

      - name: Notify Slack
        uses: slackapi/slack-github-action@v1
        with:
          webhook-url: ${{ secrets.SLACK_WEBHOOK }}
          payload: |
            {
              "text": "Deployment to ${{ inputs.environment || 'production' }} successful!",
              "blocks": [
                {
                  "type": "section",
                  "text": {
                    "type": "mrkdwn",
                    "text": "✅ *Deployment Successful*\n*Environment:* ${{ inputs.environment || 'production' }}\n*Version:* ${{ github.ref_name }}"
                  }
                }
              ]
            }
```

### Reusable Workflows
```yaml
# .github/workflows/reusable-test.yml
name: Reusable Test Workflow

on:
  workflow_call:
    inputs:
      node-version:
        required: true
        type: string
      working-directory:
        required: false
        type: string
        default: '.'
    secrets:
      codecov-token:
        required: true

jobs:
  test:
    runs-on: ubuntu-latest
    defaults:
      run:
        working-directory: ${{ inputs.working-directory }}

    steps:
      - uses: actions/checkout@v4
      - uses: actions/setup-node@v4
        with:
          node-version: ${{ inputs.node-version }}
          cache: 'npm'
          cache-dependency-path: ${{ inputs.working-directory }}/package-lock.json

      - run: npm ci
      - run: npm test -- --coverage

      - uses: codecov/codecov-action@v3
        with:
          token: ${{ secrets.codecov-token }}

# Usage in another workflow
jobs:
  test-backend:
    uses: ./.github/workflows/reusable-test.yml
    with:
      node-version: '20'
      working-directory: './backend'
    secrets:
      codecov-token: ${{ secrets.CODECOV_TOKEN }}
```

### Composite Actions
```yaml
# .github/actions/setup-project/action.yml
name: 'Setup Project'
description: 'Setup Node.js and install dependencies'

inputs:
  node-version:
    description: 'Node.js version'
    required: false
    default: '20'

runs:
  using: 'composite'
  steps:
    - uses: actions/setup-node@v4
      with:
        node-version: ${{ inputs.node-version }}
        cache: 'npm'

    - name: Install dependencies
      shell: bash
      run: npm ci

    - name: Cache build
      uses: actions/cache@v3
      with:
        path: |
          dist
          .next/cache
        key: ${{ runner.os }}-build-${{ hashFiles('**/package-lock.json') }}

# Usage
steps:
  - uses: actions/checkout@v4
  - uses: ./.github/actions/setup-project
    with: