docker.yml

name: Build and push Docker image upon release

on:
  push:
    branches:
      - 3.x

jobs:
  push_to_registry:
    name: Build and push Docker image to Docker Hub
    runs-on: ubuntu-22.04
    env:
      DOCKER_REPO: ${{ secrets.DOCKERHUB_USERNAME }}/${{ secrets.DOCKERHUB_REPOSITORY }}

    steps:
      - name: Fetch full Git history and tags
        uses: actions/checkout@v4
        with:
          fetch-depth: 0

      - name: Get the latest tag
        id: get_tag
        run: |
          TAG=$(git describe --tags `git rev-list --tags --max-count=1`)
          echo "TAG=$TAG" >> $GITHUB_ENV
          echo "::set-output name=tag::$TAG"

      - name: Checkout latest tag
        run: git checkout tags/${{ env.TAG }}

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v3

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

      - name: Check if Docker tag exists
        id: tag_check
        run: |
          TAG_EXISTS=$(curl -s -o /dev/null -w "%{http_code}" \
            https://hub.docker.com/v2/repositories/${DOCKER_REPO}/tags/${TAG}/)
          echo "exists=$TAG_EXISTS" >> $GITHUB_OUTPUT

      - name: Build and push Docker image
        if: steps.tag_check.outputs.exists != '200'
        uses: docker/build-push-action@v6
        with:
          context: .
          push: true
          tags: |
            ${{ env.DOCKER_REPO }}:latest
            ${{ env.DOCKER_REPO }}:${{ env.TAG }}