github-actions-pipeline-creator

What this skill does

# GitHub Actions Pipeline Creator

Build production-ready GitHub Actions workflows with best practices.

## Basic CI Workflow

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

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

# Cancel in-progress runs for same workflow
concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true

jobs:
  lint:
    name: Lint
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4

      - name: Setup Node.js
        uses: actions/setup-node@v4
        with:
          node-version: "20"
          cache: "npm"

      - name: Install dependencies
        run: npm ci

      - name: Run ESLint
        run: npm run lint

      - name: Run Prettier
        run: npm run format:check

      - name: Run TypeScript
        run: npm run type-check

  test:
    name: Test
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4

      - name: Setup Node.js
        uses: actions/setup-node@v4
        with:
          node-version: "20"
          cache: "npm"

      - name: Install dependencies
        run: npm ci

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

      - name: Upload coverage
        uses: codecov/codecov-action@v3
        with:
          files: ./coverage/coverage-final.json
          flags: unittests
          fail_ci_if_error: true

  build:
    name: Build
    runs-on: ubuntu-latest
    needs: [lint, test]
    steps:
      - uses: actions/checkout@v4

      - name: Setup Node.js
        uses: actions/setup-node@v4
        with:
          node-version: "20"
          cache: "npm"

      - name: Install dependencies
        run: npm ci

      - name: Build
        run: npm run build
        env:
          NODE_ENV: production

      - name: Upload build artifacts
        uses: actions/upload-artifact@v4
        with:
          name: dist
          path: dist/
          retention-days: 7
```

## Matrix Strategy

```yaml
test:
  name: Test
  runs-on: ${{ matrix.os }}
  strategy:
    matrix:
      os: [ubuntu-latest, macos-latest, windows-latest]
      node-version: [18, 20, 21]
      exclude:
        # Skip Windows + Node 18 (slow)
        - os: windows-latest
          node-version: 18
    fail-fast: false

  steps:
    - uses: actions/checkout@v4

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

    - run: npm ci
    - run: npm test
```

## Advanced Caching

```yaml
- name: Cache dependencies
  uses: actions/cache@v3
  with:
    path: |
      ~/.npm
      node_modules
      .next/cache
    key: ${{ runner.os }}-npm-${{ hashFiles('**/package-lock.json') }}
    restore-keys: |
      ${{ runner.os }}-npm-

- name: Cache build
  uses: actions/cache@v3
  with:
    path: |
      dist
      .cache
    key: build-${{ github.sha }}
    restore-keys: |
      build-
```

## Docker Build & Push

```yaml
docker:
  name: Build & Push Docker
  runs-on: ubuntu-latest
  steps:
    - uses: actions/checkout@v4

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

    - name: Login to Docker Hub
      uses: docker/login-action@v3
      with:
        username: ${{ secrets.DOCKER_USERNAME }}
        password: ${{ secrets.DOCKER_PASSWORD }}

    - name: Extract metadata
      id: meta
      uses: docker/metadata-action@v5
      with:
        images: mycompany/myapp
        tags: |
          type=ref,event=branch
          type=ref,event=pr
          type=semver,pattern={{version}}
          type=sha

    - 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=registry,ref=mycompany/myapp:buildcache
        cache-to: type=registry,ref=mycompany/myapp:buildcache,mode=max
```

## Deployment Workflow

```yaml
# .github/workflows/deploy.yml
name: Deploy

on:
  push:
    branches: [main]
  workflow_dispatch:
    inputs:
      environment:
        description: "Environment to deploy to"
        required: true
        type: choice
        options:
          - staging
          - production

jobs:
  deploy:
    name: Deploy to ${{ github.event.inputs.environment || 'staging' }}
    runs-on: ubuntu-latest
    environment:
      name: ${{ github.event.inputs.environment || 'staging' }}
      url: https://${{ steps.deploy.outputs.url }}

    steps:
      - uses: actions/checkout@v4

      - name: Download artifacts
        uses: actions/download-artifact@v4
        with:
          name: dist
          path: dist/

      - name: Deploy to Vercel
        id: deploy
        uses: amondnet/vercel-action@v25
        with:
          vercel-token: ${{ secrets.VERCEL_TOKEN }}
          vercel-org-id: ${{ secrets.VERCEL_ORG_ID }}
          vercel-project-id: ${{ secrets.VERCEL_PROJECT_ID }}
          vercel-args: ${{ github.event.inputs.environment == 'production' && '--prod' || '' }}
```

## Failure Diagnostics

```yaml
- name: Run tests
  id: test
  run: npm test
  continue-on-error: true

- name: Upload test results
  if: always()
  uses: actions/upload-artifact@v4
  with:
    name: test-results
    path: |
      test-results/
      coverage/

- name: Comment PR with results
  if: failure() && github.event_name == 'pull_request'
  uses: actions/github-script@v7
  with:
    script: |
      github.rest.issues.createComment({
        issue_number: context.issue.number,
        owner: context.repo.owner,
        repo: context.repo.repo,
        body: '❌ Tests failed. Check the [test results](${{ github.server_url }}/${{ github.repository }}/actions/runs/${{ github.run_id }})'
      })

- name: Fail if tests failed
  if: steps.test.outcome == 'failure'
  run: exit 1
```

## Composite Actions

```yaml
# .github/actions/setup-node/action.yml
name: "Setup Node.js with Cache"
description: "Setup Node.js and restore cache"

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

runs:
  using: "composite"
  steps:
    - name: Setup Node.js
      uses: actions/setup-node@v4
      with:
        node-version: ${{ inputs.node-version }}
        cache: "npm"

    - name: Install dependencies
      shell: bash
      run: npm ci
# Usage in workflow:
# - uses: ./.github/actions/setup-node
#   with:
#     node-version: '20'
```

## Conditional Jobs

```yaml
lint:
  if: github.event_name == 'pull_request'
  runs-on: ubuntu-latest
  steps: [...]

deploy:
  if: github.ref == 'refs/heads/main' && github.event_name == 'push'
  needs: [build, test]
  runs-on: ubuntu-latest
  steps: [...]
```

## Best Practices

1. **Cache dependencies**: Speeds up 3-5x
2. **Parallel jobs**: Run lint/test/build concurrently
3. **Matrix strategy**: Test multiple versions/platforms
4. **Fail fast**: Stop on first failure (or not)
5. **Upload artifacts**: Debug failures
6. **Concurrency control**: Cancel outdated runs
7. **Secrets management**: Never log secrets
8. **Status checks**: Require passing CI

## Output Checklist

- [ ] Lint job configured
- [ ] Test job with coverage
- [ ] Build job with artifacts
- [ ] Deploy job with environments
- [ ] Caching strategy implemented
- [ ] Matrix builds (if needed)
- [ ] Failure diagnostics
- [ ] PR comments on failure
- [ ] Docker build (if needed)
- [ ] Status badges in README