blue-green-cd.yml

name: Blue/Green CD for Backend

on:
  push:
    #paths: ["backend/**"]
    #branches: ["release", "*hotfix*"]

env:
  DOCKER_USERNAME: ${{ secrets.DOCKER_USERNAME }}
  GITHUB_SHA: ${{ github.sha }}

jobs:
  build:
    runs-on: ubuntu-latest

    steps:
      - name: Checkout code
        uses: actions/checkout@v4

      - name: Generate .env file and SSL files
        run: |
          cd backend
          echo "${{ secrets.ENV_FILE }}" > .env
          echo "DOCKER_USERNAME=${{ secrets.DOCKER_USERNAME }}" >> .env
          echo "GITHUB_SHA=${{ github.sha }}" >> .env

      - name: Add Remote Host Key to known_hosts
        run: |
          mkdir -p ~/.ssh
          echo "${{ secrets.SSH_PUBLIC_KEY }}" >> ~/.ssh/known_hosts

      - name: Copy some files needed for Deployment to Remote Server
        uses: appleboy/scp-action@master
        with:
          host: ${{ secrets.SSH_HOST }}
          username: ${{ secrets.SSH_USERNAME }}
          key: ${{ secrets.SSH_PRIVATE_KEY }}
          port: ${{ secrets.SSH_PORT }}
          source: "backend/.env,backend/*.sh,backend/compose*deploy.yml,backend/*nginx*"
          target: "~/app/"
          overwrite: true

      - name: Login to Docker Hub
        uses: docker/login-action@v3
        with:
          username: ${{ secrets.DOCKER_USERNAME }}
          password: ${{ secrets.DOCKER_ACCESS_TOKEN }}

      - name: Setup docker-compose
        uses: KengoTODA/actions-setup-docker-compose@v1.2.1
        with:
          version: "2.24.5"

      - name: Create a Builder Instance
        run: |
          docker buildx create --name buildx
          docker buildx use buildx

      - name: Build & Push Docker Images (Blue & Green)
        run: |
          cp package.json backend/package.json
          cp package-lock.json backend/package-lock.json
          cp -r packages backend/packages
          cd backend
          docker-compose -f compose.blue-build.yml build --builder buildx --build-arg BUILDKIT_INLINE_CACHE=1
          docker-compose -f compose.green-build.yml build --builder buildx --build-arg BUILDKIT_INLINE_CACHE=1
          docker-compose -f compose.blue-build.yml push
          docker-compose -f compose.green-build.yml push

  deploy:
    needs: build
    runs-on: ubuntu-latest

    steps:
      - name: Login to Docker Hub
        uses: docker/login-action@v3
        with:
          username: ${{ secrets.DOCKER_USERNAME }}
          password: ${{ secrets.DOCKER_ACCESS_TOKEN }}

      - name: Run a New Version of the application on Remote Server
        uses: appleboy/ssh-action@master
        env:
          SLACK_WEBHOOK_URI: ${{ secrets.SLACK_WEBHOOK_URI_FOR_GITHUB_ACTIONS }}
          GITHUB_WORKFLOW: ${{ github.workflow }}
          GITHUB_REF: ${{ github.ref }}
          GITHUB_ACTOR: ${{ github.actor }}
        with:
          host: ${{ secrets.SSH_HOST }}
          username: ${{ secrets.SSH_USERNAME }}
          key: ${{ secrets.SSH_PRIVATE_KEY }}
          port: ${{ secrets.SSH_PORT }}
          envs: SLACK_WEBHOOK_URI,GITHUB_WORKFLOW,GITHUB_REF,GITHUB_ACTOR
          script: |
            cd ~/app/backend
            chmod +x deploy.sh
            DEPLOYMENT_RESULT='Success'
            ./deploy.sh || DEPLOYMENT_RESULT='Fail'
            chmod +x send-slack-message.sh
            ./send-slack-message.sh $SLACK_WEBHOOK_URI $DEPLOYMENT_RESULT $GITHUB_REF $GITHUB_ACTOR $GITHUB_WORKFLOW