Heroku Review Apps managed by GitHub Actions

README.md

Heroku Review Apps managed by GitHub Actions

This gist aims to provide a simple solution for managing Heroku Review Apps with GitHub Actions due to the security incident that continues to disrupt Heroku's GitHub integration.

.github
├── workflows
│   ├── heroku_review_app_create.yml
│   └── heroku_review_app_destroy.yml

Triggers

• Pull Request opened - create/update review app
• Pull Request reopened - create/update review app
• Pull Request synchronize (push) - update review app
• Pull Request closed - destroy review app

Dependencies

• actions/checkout
• akhileshns/heroku-deploy
• chrnorm/deployment-action
• chrnorm/deployment-status
• thollander/actions-comment-pull-request

Create/Update Heroku Review App

Creates a Heroku Review App on PR open or reopen, also updates the Review App on any push to the PR

.github/workflows/heroku_review_app_create.yml

Steps

1. Set dynamic env vars - Allows us to reuse/compose global env vars
2. Check out PR code from GitHub
3. Create GitHub deployment - Wire up the github deployment so links to view deployment are valid on the PR
4. Login to Heroku
5. Create Heroku Review App
6. Set Heroku Review App environment - Setup Heroku env vars (copy GitHub secrets etc...)
7. Add Heroku Review App to pipeline
8. Add Heroku git remote
9. Push PR branch to Heroku
10. Initialize the Heroku Review App database
11. Migrate and seed the Heroku Review App database - Migrations must work and seeds must be idempotent
12. Update deployment status on GitHub - Updates the PR with a link to the Review App deployment

Destroy Heroku Review App

.github/workflows/heroku_review_app_destroy.yml

Steps

1. Set dynamic env vars - Allows us to reuse/compose global env vars
2. Login to Heroku
3. Destroy Heroku Review App
4. Comment on PR

GitHub Secrets

You'll need to configure your GitHub repo with the following Action secrets. NOTE: This is the minimal set.

• HEROKU_API_KEY - Your Heroku user's API key
• HEROKU_EMAIL - Your Heroku user's email address
• RAILS_MASTER_KEY - [optional] The Rails master key used for encrypted credentials

---

This effort is sponsored by Orbit.love (mission control for your community).

heroku_review_app_create.yml

# SEE: https://docs.github.com/en/actions/using-workflows/events-that-trigger-workflows
on:
  pull_request:
    types:
      - opened
      - reopened
      - synchronize

# SEE: https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#permissions
permissions:
  contents: read
  deployments: write
  pull-requests: read

# Update these variables for your project
env:
  GITHUB_DEPLOYMENT_ENVIRONMENT: heroku-review-app
  HEROKU_REVIEW_APP_ADDONS: --addons=heroku-postgresql:hobby-dev
  HEROKU_PIPELINE_NAME: review-apps

jobs:
  # Creates a Heroku Review App on PR open or reopen, also updates the Review App on any push to the PR
  heroku_review_app_deploy:
    name: Create/Update Heroku Review App
    runs-on: ubuntu-latest
    if: github.event.pull_request.state != 'closed'
    steps:
      # Allows us to reuse/compose global env vars
      - name: Set dynamic env vars
        run: echo "HEROKU_APP_NAME=${{ env.HEROKU_PIPELINE_NAME }}-review-app-${{ github.event.number }}" >> $GITHUB_ENV

      - name: Check out PR code from GitHub
        uses: actions/checkout@v3
        with:
          fetch-depth: 0
          ref: ${{ github.head_ref }}

      # Wire up the github deployment so links to `view deployment` are valid on the PR
      - name: Create GitHub deployment
        uses: chrnorm/deployment-action@releases/v1
        id: deployment
        with:
          initial_status: in_progress
          token: ${{ github.token }}
          target_url: https://${{ env.HEROKU_APP_NAME}}.herokuapp.com/
          environment: ${{ env.GITHUB_DEPLOYMENT_ENVIRONMENT }}
          ref: ${{ github.head_ref }}

      - name: Login to Heroku
        uses: akhileshns/heroku-deploy@v3.12.12
        with:
          heroku_app_name: ${{ env.HEROKU_APP_NAME }}
          heroku_api_key: ${{ secrets.HEROKU_API_KEY }}
          heroku_email: ${{ secrets.HEROKU_EMAIL }}
          justlogin: true

      - name: Create Heroku Review App
        if: github.event.action != 'synchronize'
        run: heroku apps:create ${{ env.HEROKU_APP_NAME }} ${{ env.HEROKU_REVIEW_APP_ADDONS }}

      # Setup Heroku env vars (copy GitHub secrets etc...)
      - name: Set Heroku Review App environment
        run: >-
          heroku config:set
          --app=${{ env.HEROKU_APP_NAME }}
          RAILS_MASTER_KEY='${{ secrets.RAILS_MASTER_KEY }}'
          EXAMPLE='${{ secrets.example }}'

      - name: Add Heroku Review App to pipeline
        if: github.event.action != 'synchronize'
        run: heroku pipelines:add ${{ env.HEROKU_PIPELINE_NAME }} --app=${{ env.HEROKU_APP_NAME }} --stage=development

      - name: Add Heroku git remote
        run: heroku git:remote --app=${{ env.HEROKU_APP_NAME }}

      - name: Push PR branch to Heroku
        run: git push heroku ${{ github.head_ref }}:main --force

      - name: Initialize the Heroku Review App database
        if: github.event.action != 'synchronize'
        run: heroku run rails db:schema:load --app=${{ env.HEROKU_APP_NAME }}

      # Migrations must work and seeds must be idempotent
      - name: Migrate and seed the Heroku Review App database
        run: heroku run rails db:migrate db:seed --app=${{ env.HEROKU_APP_NAME }}

      # Updates the PR with a link to the Review App deployment
      - name: Update deployment status on GitHub
        uses: chrnorm/deployment-status@releases/v1
        with:
          token: ${{ github.token }}
          target_url: https://${{ env.HEROKU_APP_NAME }}.herokuapp.com/
          environment_url: https://${{ env.HEROKU_APP_NAME }}.herokuapp.com/
          state: success
          deployment_id: ${{ steps.deployment.outputs.deployment_id }}

heroku_review_app_destroy.yml

# SEE: https://docs.github.com/en/actions/using-workflows/events-that-trigger-workflows
on:
  pull_request:
    types:
      - closed

# SEE: https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#permissions
permissions:
  pull-requests: write

# Update these variables for your project
env:
  HEROKU_REVIEW_APP_ADDONS: --addons=heroku-postgresql:hobby-dev
  HEROKU_PIPELINE_NAME: review-apps

jobs:
  # Destroys the PR's Review App on Heroku
  heroku_review_app_destroy:
    name: Destroy Heroku Review App
    runs-on: ubuntu-latest
    steps:
      - name: Set dynamic env vars
        run: echo "HEROKU_APP_NAME=${{ env.HEROKU_PIPELINE_NAME }}-review-app-${{ github.event.number }}" >> $GITHUB_ENV

      - name: Login to Heroku
        uses: akhileshns/heroku-deploy@v3.12.12
        with:
          heroku_api_key: ${{ secrets.HEROKU_API_KEY }}
          heroku_app_name: ${{ env.HEROKU_APP_NAME }}
          heroku_email: ${{ secrets.HEROKU_EMAIL }}
          justlogin: true

      - name: Destroy Heroku Review App
        run: heroku apps:destroy --app=${{ env.HEROKU_APP_NAME }} --confirm=${{ env.HEROKU_APP_NAME }}

      - name: Comment on PR
        uses: thollander/actions-comment-pull-request@v1
        with:
          message: ":warning: The Heroku Review App **${{ env.HEROKU_APP_NAME }}** has been destroyed."
          GITHUB_TOKEN: ${{ github.token }}