deploy-pr.yml

# Uses label to decide which environment to deploy to.
# e.g. "dev-blue" or "dev-green"
name: "Deploy: PR"

on:
  pull_request:
    types:
      - synchronize
      - labeled

env:
  # deploy only if any PR label is "dev-green" or "dev-blue"
  DO_DEPLOY: ${{ contains(github.event.pull_request.labels.*.name, 'dev-green') || contains(github.event.pull_request.labels.*.name, 'dev-blue') }}
  # really hacky expression because Github Actions
  # lacks real conditional statements
  DEPLOY_ENV: ${{ contains(github.event.pull_request.labels.*.name, 'dev-green') && 'dev-green' || 'dev-blue' }}

jobs:
  pr:
    # env not available for job if
    if: ${{ contains(github.event.pull_request.labels.*.name, 'dev-green') || contains(github.event.pull_request.labels.*.name, 'dev-blue') }}
    uses: ./.github/workflows/use-deploy-ecs.yml
    with:
      deployment-env: ${{ contains(github.event.pull_request.labels.*.name, 'dev-green') && 'dev-green' || 'dev-blue' }} # env not valid here either
    secrets:
      aws-role-arn: ${{ secrets.AWS_ROLE_ARN }}
      docker-repo: ${{ secrets.DOCKER_REPO }}

  notify:
    needs: [pr]
    uses: ./.github/workflows/use-notify-slack.yml
    if: ${{ success() || failure() }}
    secrets:
      slack-webhook: ${{ secrets.SLACK_WEBHOOK }}
    with:
      job-status: ${{ needs.pr.result }}
      success-message: |
        PR#${{ github.event.pull_request.number }} (`${{ github.ref_name }}` branch) deployed to ${{ contains(github.event.pull_request.labels.*.name, 'dev-green') && 'dev-green' || 'dev-blue' }}
      failure-message: |
        PR#${{ github.event.pull_request.number }} failed to deploy to ${{ contains(github.event.pull_request.labels.*.name, 'dev-green') && 'dev-green' || 'dev-blue' }}

  cleanup:
    runs-on: ubuntu-20.04
    needs: [pr]
    steps:
      - name: Unlabel other PRs (if needed)
        if: ${{ env.DO_DEPLOY }}
        run: |
          labelled=$(curl -s \
          "${{ github.event.repository.url }}/issues?state=all&labels=${{ env.DEPLOY_ENV }}" \
          | jq -r '.[].url')

          for url in ${labelled};  do
            echo "${url}"
            if [[ "${url}" != ${{ github.event.pull_request.issue_url }} && "${url}" != "" ]]; then
              curl -X DELETE \
                -H "Accept: application/vnd.github.v3+json" \ 
                -H "Authorization: Bearer ${{ secrets.GITHUB_TOKEN }}" \
                "$url/labels/${{ env.DEPLOY_ENV }}"
            fi
          done