docker-image-local.yml

name: Build and push Docker image (local)

on:
  push:
    branches:
      - main
    paths:
      - 'backend/**'
  workflow_dispatch:
    inputs:
      target_branch:
        description: 'Local branch to merge into (default: local)'
        required: false
        default: 'local'

permissions:
  contents: write

jobs:
  merge-and-build:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout repository
        uses: actions/checkout@v4
        with:
          fetch-depth: 0
          persist-credentials: true

      - name: Set target branch
        run: echo "TARGET_BRANCH=${{ github.event.inputs.target_branch || 'local' }}" >> $GITHUB_ENV

      - name: Configure Git
        run: |
          git config user.name "github-actions[bot]"
          git config user.email "github-actions[bot]@users.noreply.github.com"

      - name: Fetch branches
        run: |
          git fetch origin main
          git fetch origin $TARGET_BRANCH || true

      - name: Checkout target branch
        run: |
          if git rev-parse --verify origin/$TARGET_BRANCH >/dev/null 2>&1; then
            git checkout -B $TARGET_BRANCH origin/$TARGET_BRANCH
          else
            git checkout -B $TARGET_BRANCH
          fi

      - name: Merge main into target branch
        run: |
          set -o pipefail
          if git merge --no-edit origin/main; then
            echo "Merge succeeded"
          else
            echo "Merge failed. Showing status and conflicted files:" >&2
            git status --porcelain
            git --no-pager diff --name-only --diff-filter=U || true
            exit 1
          fi

      - name: Push merged branch
        run: git push origin HEAD:$TARGET_BRANCH

      - name: Set up Java
        uses: actions/setup-java@v4
        with:
          java-version: '21'
          distribution: 'temurin'

      - name: Build with Maven
        run: mvn -DskipTests package
        working-directory: backend

      - name: Login to DockerHub
        uses: docker/login-action@v2
        with:
          username: ${{ secrets.DOCKERHUB_USERNAME }}
          password: ${{ secrets.DOCKERHUB_TOKEN }}

      - name: Build Docker image
        run: docker build -t ${{ secrets.DOCKERHUB_USERNAME }}/transformer-tracker-local:latest .
        working-directory: backend

      - name: Push image
        run: docker push ${{ secrets.DOCKERHUB_USERNAME }}/transformer-tracker-local:latest