This is github actions that used to build docker image, deploy to docker hub and Heroku

main.yaml

# This is a basic workflow to help you get started with Actions
name: CI-CD
# Controls when the action will run. 
on:
  # Triggers the workflow on push or pull request events but only for the main branch
  push:
    branches: [ main ]
  pull_request:
    branches: [ main ]
  # Allows you to run this workflow manually from the Actions tab
  workflow_dispatch:

# A workflow run is made up of one or more jobs that can run sequentially or in parallel
jobs:
  # This workflow contains multiple jobs
  build_test:
    # The type of runner that the job will run on
    runs-on: ubuntu-latest
    strategy:
      matrix:
        node-version: [14.x]
    # Steps represent a sequence of tasks that will be executed as part of the job
    steps:
      # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
      - uses: actions/checkout@v2
      - name: setup node
        uses: actions/setup-node@master
        with:
          node-version: ${{ matrix.node-version }}
      # install applicaion dependencies
      - name: Install dependencies
        run: |
          npm install
          npm ci 
      # build and test the apps     
      - name: build & test
        run: |
          npm run build
          npm run test

  push_to_Docker_Hub:
      # The type of runner that the job will run on
      runs-on: ubuntu-latest
      # build docker image and push to docker hub
      # only if the app build and test successfully
      needs: [build_test]
      steps:
        - name: checkout repo
          uses: actions/checkout@v2
        - name: Set up QEMU
          uses: docker/setup-qemu-action@v1
        - name: Set up Docker Buildx
          uses: docker/setup-buildx-action@v1
        - name: Login to DockerHub
          uses: docker/login-action@v1
          with:
            username: ${{ secrets.DOCKERHUB_USERNAME }}
            password: ${{ secrets.DOCKERHUB_TOKEN }}
        - name: Build and push
          uses: docker/build-push-action@v2
          with:
            context: ./
            file: ./Dockerfile
            push: true
            tags: ${{ secrets.DOCKERHUB_USERNAME }}/nodejs-demo:latest     
        - name: Run the image in a container
          uses: addnab/docker-run-action@v3
          with:
            image: ${{ secrets.DOCKERHUB_USERNAME }}/nodejs-demo:latest
            run: |
              echo "runing the docker image"
              echo "Testing the nodejs  app endpoints"
              echo ${{ steps.docker_build.outputs.digest }}

  deploy_to_heroku:
    runs-on: ubuntu-latest
    # only run this fater deploying to docker
    needs: [push_to_Docker_Hub]
    steps:
      - name: checkout repo
        uses: actions/checkout@v2
      # more info on deploy to heroku: 
      # https://github.com/marketplace/actions/deploy-to-heroku
      - name: deploy to Heroku
        uses: akhileshns/heroku-deploy@v3.12.12
        with:
          heroku_api_key: ${{ secrets.HEROKU_API_KEY }}
          heroku_app_name: ${{ secrets.HEROKU_APP_NAME }}
          heroku_email: ${{ secrets.HEROKU_EMAIL }}
          # build the app docker image using the Dockerfile
          # and run that image in a container that's pushed to heroku
          usedocker: true