packer/.github/workflows/website-docker-publish.yml

name: "Website Docker Publish"

on:
  push:
    # Sequence of patterns matched against refs/heads
    branches:    
      # Push events on master branch
      - 'master'

jobs:
  website-docker-image:
    runs-on: ubuntu-latest  
    name: Build Docker Image if Necessary
    env: 
      DOCKER_USER: ${{ secrets.WEBSITE_DOCKER_USER }}
      DOCKER_TOKEN: ${{ secrets.WEBSITE_DOCKER_TOKEN }}
    steps:
      - uses: actions/checkout@v2
      - uses: docker/login-action@v1
        with:
          username: ${{ env.DOCKER_USER }}
          password: ${{ env.DOCKER_TOKEN }}
      - run: |
          IMAGE_TAG=$(cat website/Dockerfile website/package-lock.json | sha256sum | awk '{print $1;}')
          echo "Using $IMAGE_TAG"
          if curl https://hub.docker.com/v2/repositories/hashicorp/packer-website/tags/$IMAGE_TAG -fsL > /dev/null; then
              echo "Dependencies have not changed, not building a new website docker image."
          else
            cd website/
            docker build -t hashicorp/packer-website:$IMAGE_TAG .
            docker tag hashicorp/packer-website:$IMAGE_TAG hashicorp/packer-website:latest
            docker push hashicorp/packer-website
          fi