main.yml

name: Build and Deploy to Google Compute Engine

on:
  push:
    branches: [main]

jobs:
  build-and-deploy:
    runs-on: ubuntu-latest

    strategy:
      matrix:
        node-version: [20.x]

    steps:
      - name: Checkout
        uses: actions/checkout@v2
   
      - name: Use Node.js ${{ matrix.node-version }}
        uses: actions/setup-node@v3
        with:
          node-version: ${{ matrix.node-version }}

      - name: Install dependencies
        run: npm ci

      # Authenticate to Google Cloud
      - name: Authenticate to Google Cloud
        uses: google-github-actions/auth@v1
        with:
          credentials_json: ${{ secrets.GCP_SA_KEY }}

      # Setup gcloud CLI
      - name: Setup Google Cloud SDK
        uses: google-github-actions/setup-gcloud@v2
        with:
          version: '416.0.0'
          project_id: ${{ secrets.GCP_PROJECT_ID }}

      # Configure Docker to use the gcloud command-line tool as a credential
      # helper for authentication
      - run: |-
          gcloud --quiet auth configure-docker

      # Build the Docker image
      - name: Build
        run: |
          docker build --tag "gcr.io/${{ secrets.GCP_PROJECT_ID }}/${{ secrets.GCP_INSTANCE_NAME }}-image:${{ github.sha }}" .

      # Push the Docker image to Google Container Registry
      - name: Publish
        run: |
          docker push "gcr.io/${{ secrets.GCP_PROJECT_ID }}/${{ secrets.GCP_INSTANCE_NAME }}-image:${{ github.sha }}"

      # Deploy the Docker container on GCE
      - name: Deploy
        run: |
          # Add container metadata if not already set
          gcloud compute instances add-metadata "${{ secrets.GCP_INSTANCE_NAME }}" \
            --zone "${{ secrets.GCP_INSTANCE_ZONE }}" \
            --metadata gce-container-declaration='{"containers":[{"name":"my-container","image":"gcr.io/${{ secrets.GCP_PROJECT_ID }}/${{ secrets.GCP_INSTANCE_NAME }}-image:${{ github.sha }}"}]}'
          
          # Update the container
          gcloud compute instances update-container "${{ secrets.GCP_INSTANCE_NAME }}" \
            --zone "${{ secrets.GCP_INSTANCE_ZONE }}" \
            --container-image "gcr.io/${{ secrets.GCP_PROJECT_ID }}/${{ secrets.GCP_INSTANCE_NAME }}-image:${{ github.sha }}"