docker.yaml

name: Build and Push Docker Image

on:
  push:
    branches:
      - app

permissions:
  contents: write
  pull-requests: write

jobs:
  build:
    runs-on: ubuntu-latest

    steps:
      # Step 1: Checkout the 'app' branch code
      - name: Checkout app branch code
        uses: actions/checkout@v4

      # Step 2: Install jq to parse package.json
      - name: Install jq
        run: sudo apt-get install -y jq

      # Step 3: Get version from 'app' branch
      - name: Get version from app branch
        id: app_version
        run: |
          APP_VERSION=$(cat app/package.json | jq -r .version)
          echo "APP_VERSION=$APP_VERSION" >> $GITHUB_ENV
          echo "Version on 'app' branch: $APP_VERSION"

      # Step 4: Set up Docker in the workflow
      - name: Set up Docker
        uses: docker/setup-buildx-action@v3

      # Step 5: Log in to Docker Hub using secrets
      - name: Log in to Docker Hub
        uses: docker/login-action@v3
        with:
          username: ${{ secrets.DOCKER_USER }}
          password: ${{ secrets.DOCKER_PASS }}

      # Step 6: Build Docker image with version tag
      - name: Build Docker image
        run: |
          docker build -t ${{ secrets.DOCKER_USER }}/gitops-app:${{ env.APP_VERSION }} app/.

      # Step 7: Push Docker image to Docker Hub
      - name: Push Docker image
        run: |
          docker push ${{ secrets.DOCKER_USER }}/gitops-app:${{ env.APP_VERSION }}

      # Step 8: Checkout the 'main' branch code
      - name: Checkout main branch code
        uses: actions/checkout@v4
        with:
          ref: main

      # Step 9: Get version from 'main' branch
      - name: Get version from main branch
        id: main_version
        run: |
          MAIN_VERSION=$(cat app/package.json | jq -r .version)
          echo "MAIN_VERSION=$MAIN_VERSION" >> $GITHUB_ENV
          echo "Version on 'main' branch: $MAIN_VERSION"

      # Step 10: Compare versions between 'app' and 'main' branches
      - name: Compare versions
        id: version_check
        run: |
          if [ "$APP_VERSION" != "$MAIN_VERSION" ]; then
            echo "Version changed: Creating PR."
            echo "VERSION_CHANGED=true" >> $GITHUB_ENV
          else
            echo "No version change: Skipping PR."
            echo "VERSION_CHANGED=false" >> $GITHUB_ENV
          fi

      # Step 11: Reset 'app' branch to the latest code
      - name: Reset app branch
        run: |
          git fetch origin app
          git reset --hard origin/app

      # Step 12: Create a Pull Request only if the version changed and Docker image was built successfully
      - name: Create Pull Request
        if: success() && env.VERSION_CHANGED == 'true'
        uses: peter-evans/create-pull-request@v7
        with:
          branch: merge-app-${{ env.APP_VERSION }}
          title: "Automated PR: Merge 'app' into 'main' (Version ${{ env.APP_VERSION }})"
          labels: image-built