Setup docker

Building and publishing docker images

• Docker documentation: Configure GitHub Actions
• How to publish a docker image into the Github package registry

.github/workflows/docker.yml

name: Create and publish a Docker image

on:
  push:
    branches: ['main']

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

jobs:
  build-and-push-image:
    runs-on: ubuntu-latest

    # GITHUB_TOKEN permissions
    permissions:
      contents: read
      packages: write

    steps:
      - name: Checkout repository
        uses: actions/checkout@v2
      - name: Setup Buildx
        uses: docker/setup-buildx-action@v2
      - name: Log in to the Container registry
        uses: docker/login-action@v1
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Extract metadata (tags, labels) for Docker
        id: meta
        uses: docker/metadata-action@v3
        with:
          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}

      - name: Build and push Docker image
        uses: docker/build-push-action@v2
        with:
          context: .
          push: true
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}

Run docker containers in Github actions

Use container keyword

Running jobs in a container in GitHub actions.

.github/workflows/test-container.yml

name: container
on: push

jobs:
  node-docker:
    runs-on: ubuntu-latest
    container:
      image: node:14.15.0-alpine3.12
    steps:
      - name: Log the node version
        run: |
          node -v
          cat /etc/os-release

Docker run command

Use the regular docker run command. Here we use > to fold commands in YAML.

.github/workflows/test-container.yml

name: container
on: push

env:
  IMG: "node:14.15.0-alpine3.12"

jobs:
  node-docker:
    runs-on: ubuntu-latest
    steps:
      - name: Log the node version
        run: >
          docker run -rm -v $(pwd):/tmp -w /tmp
          ${{ env.IMG }}
          bash -c "node -v; cat /etc/os-release"

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