Pushing to a Registry (CD)

Once your image is built and tested, you deploy it by pushing it to a Container Registry (like Docker Hub, AWS ECR, or GitHub Container Registry - GHCR).

Authentication

Before you can push, you must log in. Use secrets to handle the credentials.

jobs:
  push:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      
      - name: Login to Docker Hub
        uses: docker/login-action@v3
        with:
          username: ${{ secrets.DOCKERHUB_USERNAME }}
          password: ${{ secrets.DOCKERHUB_TOKEN }}
          
      - name: Build and Push
        uses: docker/build-push-action@v5
        with:
          context: .
          push: true
          tags: myusername/myapp:latest

This completes a full CI/CD pipeline: Code is pushed -> Tests are run -> If successful, Docker image is built -> Image is deployed to registry!