GitHub action to add AWS Amplify URL to PR comments and Slack

amplify-url-notification.yml

name: Amplify Branch URL notifications
on:
  create:
  pull_request:
    types: [opened]

jobs:
  add_url_comment:
    name: Add Amplify deploy URL to PR comments and Slack
    runs-on: ubuntu-latest

    steps:
      - name: Checkout code
        uses: actions/checkout@v2
      - name: Set branch name
        if: ${{ github.event_name == 'create' }}
        run: echo "::set-env name=BRANCH_NAME::${GITHUB_REF#refs/heads/}"
      - name: Set domain name for releases
        if: ${{ github.event_name == 'create' && contains(github.ref, 'release/') }}
        run: echo "::set-env name=DOMAIN_NAME::custom-prod-domain.com"
      - name: Set domain name for non-releases
        if: ${{ github.event_name == 'create' && !contains(github.ref, 'release/') }}
        run: echo "::set-env name=DOMAIN_NAME::custom-test-domain.com"
      - name: Slack notification for new production deploy version
        if: ${{ github.event_name == 'create' && contains(github.ref, 'tags') }}
        env:
          SLACK_WEBHOOK: ${{ secrets.SLACK_DEV_NOTICES_WEBHOOK }}
        run: 'curl -X POST -H "Content-type: application/json" --data "{\"text\":\"New production deploy, v${BRANCH_NAME#refs/tags/}: https://${DOMAIN_NAME}\"}" ${SLACK_WEBHOOK}'
      - name: Slack notification for branch creation
        if: ${{ github.event_name == 'create' && !contains(github.ref, 'tags') }}
        env:
          SLACK_WEBHOOK: ${{ secrets.SLACK_DEV_NOTICES_WEBHOOK }}
        run: 'curl -X POST -H "Content-type: application/json" --data "{\"text\":\"New Amplify branch URL: https://${BRANCH_NAME//[\/\.]/-}.${DOMAIN_NAME}\"}" ${SLACK_WEBHOOK}'
      - name: Add PR comment
        if: ${{ github.event_name == 'pull_request' }}
        env:
          GH_API_TOKEN: ${{ secrets.GH_ACTIONS_API_TOKEN }}
        run: 'curl -s -H "Authorization: token ${GH_API_TOKEN}" -X POST -d "{\"body\": \"Amplify URL: https://${GITHUB_HEAD_REF//[\/\.]/-}.custom-test-domain.com\"}" "https://api.github.com/repos/YOUORYOURORG/REPONAME/issues/${GITHUB_REF//[a-z\/]/}/comments"'