docker-publish.yml

name: Build and Push Docker Image to Docker Hub

on:
  # Manual Run
  workflow_dispatch:
  # Push to branches
  push:
    branches:
      - dev
      - main
      - master
  # Pull Requests
  pull_request:
    branches:
      - dev
      - main
      - master
  # Scheduled runs
  # schedule:
  #   - cron: "0 0 * * *"

env:
  DOCKER_REGISTRY: docker.io
  DOCKER_IMAGE_NAME: ${{ vars.DOCKER_IMAGE_NAME }}

jobs:
  push_to_registry:
    name: Push Docker image to Docker Hub
    runs-on: ubuntu-latest
    steps:
      - name: Checkout git repository
        uses: actions/checkout@v4
        with:
          ref: ${{ github.ref }}

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

      - name: Log in to Docker Registry
        uses: docker/login-action@v3
        with:
          username: ${{ secrets.DOCKER_REGISTRY_USERNAME }}
          password: ${{ secrets.DOCKER_REGISTRY_TOKEN }}

      - name: Extract metadata (tags, labels) for Docker
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: ${{ env.DOCKER_REGISTRY }}/${{ env.DOCKER_IMAGE_NAME }}

      - name: Build and push Docker image
        uses: docker/build-push-action@v6
        with:
          context: "{{defaultContext}}"
          push: true
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}
      
      - name: Update latest tag (for main/master branches)
        run: |
          BRANCH_NAME=${GITHUB_REF#refs/heads/}
          if [[ "$BRANCH_NAME" == "main" || "$BRANCH_NAME" == "master" ]]; then
            echo "Updating latest tag on Docker Hub"
            docker pull "${{ env.DOCKER_REGISTRY }}/${{ env.DOCKER_IMAGE_NAME }}:$BRANCH_NAME"
            docker tag "${{ env.DOCKER_REGISTRY }}/${{ env.DOCKER_IMAGE_NAME }}:$BRANCH_NAME" "${{ env.DOCKER_REGISTRY }}/${{ env.DOCKER_IMAGE_NAME }}:latest"
            docker push "${{ env.DOCKER_REGISTRY }}/${{ env.DOCKER_IMAGE_NAME }}:latest"
          else
            echo "Skipped."
          fi