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

#
# This GitHub action builds, tags, and publishes the Packer 
# website docker image when dependencies have changed. 
# Failures are reported to slack.
#

name: "Website Docker Publish"

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

jobs:
  website-docker-publish:
    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          
  # Send a slack notification if the job defined above fails
  slack-notify:
    needs: 
      - website-docker-publish
    if: always() && (needs.website-docker-publish.result == 'failure')
    runs-on: ubuntu-latest
    steps:
      - name: Send slack notification on failure
        uses: slackapi/slack-github-action@v1.18.0
        with:
          payload: |
            {
              "text": ":alert: Packer Website Docker Publish *FAILED* :alert:",
              "attachments": [
                {
                  "color": "#C41E3A",
                  "blocks": [
                    {
                      "type": "section",
                      "text": {
                        "type": "mrkdwn",
                        "text": "Branch: `${{ github.ref_name }}`\nRef: ${{ github.event.pull_request.html_url || github.event.head_commit.url }}\nWorkflow: ${{ github.server_url }}/${{ github.repository }}/actions/runs/${{ github.run_id }}"
                      }
                    }
                  ]
                }
              ]
            }            
        env:
          SLACK_WEBHOOK_URL: ${{ secrets.SLACK_WEBHOOK_URL }}
          SLACK_WEBHOOK_TYPE: INCOMING_WEBHOOK