GitHub Actions.md

Using GitHub Actions to build your Docker Image

To sheds more light on using GitHub Actions, this documentation breaks down the commands into simple bits: https://docs.github.com/en/actions

N/B: your file must end with .yml OR .yaml

File structure for using GitHub Actions in your project folder.

├── .github
│   ├── workflows
│       ├── ci.yaml
├── project base folder
│   ├── other folders 
├── .env
├── package.json
├── package-lock.json
├── LICENSE
└── README.md

The code block starts below

name: CI

on:
  push:
    branches: [main]

  workflow_dispatch:

jobs:
  push_to_registry:
    name: Push Docker image to Docker Hub
    runs-on: ubuntu-latest

    steps:
      - name: Check out the repo
        uses: actions/checkout@v3

      - name: Log in to Docker Hub
        uses: docker/login-action@v2
        with:
          username: ${{ secrets.DOCKER_USERNAME }}
          password: ${{ secrets.DOCKER_PASSWORD }}

      - name: Extract metadata (tags, labels) for Docker
        id: meta
        uses: docker/build-push-action@v3
        with:
          images: DOCKER_HUB_USERNAME/DOCKER_HUB_REPO_NAME

      - name: Build and push Docker image
        uses: docker/build-push-action@v3
        with:
          context: .
          push: true
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}

An example to shed more light on this

The code block starts below

name: CI

on:
  push:
    branches: [main]

  workflow_dispatch:

jobs:
  push_to_registry:
    name: Push Docker image to Docker Hub
    runs-on: ubuntu-latest

    steps:
      - name: Check out the repo
        uses: actions/checkout@v3

      - name: Log in to Docker Hub
        uses: docker/login-action@v2
        with:
          username: ${{ secrets.DOCKER_USERNAME }}
          password: ${{ secrets.DOCKER_PASSWORD }}

      - name: Extract metadata (tags, labels) for Docker
        id: meta
        uses: docker/build-push-action@v3
        with:
          images: seunfunmi/node-application

      - name: Build and push Docker image
        uses: docker/build-push-action@v3
        with:
          context: ./node-application
          push: true
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}