GitHub action flow to deploy multi-env cdk app that then deploy an Amplify frontend

multi-env-backend-deploy-then-amplify.yml

name: Deploy CDK Project
on:
  push:
    branches:
      - develop
  pull_request:
    branches:
      - main
    types:
      - closed

jobs:
  aws_cdk:
    if: github.event.pull_request.merged == true || github.event_name == 'push'
    runs-on: ubuntu-latest
    steps:
      - name: Checkout repo
        uses: actions/checkout@v3
      - uses: actions/setup-node@v2
        with:
          node-version: '18'
      - run: npm install
      - name: cdk diff
        uses: youyo/aws-cdk-github-actions@v2
        with:
          cdk_subcommand: 'diff'
          actions_comment: true
        env:
          AWS_ACCESS_KEY_ID: ${{ secrets.AWS_ACCESS_KEY_ID }}
          AWS_SECRET_ACCESS_KEY: ${{ secrets.AWS_SECRET_ACCESS_KEY }}
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
      - name: cdk deploy
        uses: youyo/aws-cdk-github-actions@v2
        with:
          cdk_subcommand: 'deploy'
          cdk_stack: '*'
          cdk_args: '--require-approval never'
          actions_comment: false
        env:
          AWS_ACCESS_KEY_ID: ${{ secrets.AWS_ACCESS_KEY_ID }}
          AWS_SECRET_ACCESS_KEY: ${{ secrets.AWS_SECRET_ACCESS_KEY }}
      - name: Trigger Amplify Build (optional)
        run: |
          if [ "${{ github.event_name }}" == "push" ] && [ "${{ github.ref }}" == "refs/heads/develop" ]; then
            WEBHOOK_URL="${{ secrets.DEVELOP_WEBHOOK_URL }}"
          elif [ "${{ github.event_name }}" == "pull_request" ] && [ "${{ github.event.pull_request.merged }}" == "true" ]; then
            WEBHOOK_URL="${{ secrets.MAIN_WEBHOOK_URL }}"
          fi

          if [ ! -z "${WEBHOOK_URL}" ]; then
            curl -X POST -d {} "${WEBHOOK_URL}" -H "Content-Type:application/json"
          fi