docker-build.yml

name: Build and Push Docker Image

on:
  workflow_run:
    workflows: ["Django tests"]
    types:
      - completed
    branches:
      - dev
      - main

jobs:
  build:
    runs-on: ubuntu-latest
    if: ${{ github.event.workflow_run.event == 'push' && github.event.workflow_run.conclusion == 'success' }}
    environment: build
    concurrency:
      group: deploy-group-${{ github.ref }}
      cancel-in-progress: true
    outputs:
      branch: "${{ github.event.workflow_run.outputs.branch }}"

    steps:
      - name: Checkout code
        uses: actions/checkout@v3
        with:
          ref: "${{ github.event.workflow_run.outputs.branch }}"
          fetch-depth: 0  # Fetch the entire history to ensure 'HEAD^' is resolvable

      - name: Debug github refs
        run: |
          echo "github.event.workflow_run.outputs.branch = ${{ github.event.workflow_run.outputs.branch }}"

      - name: Check if Dockerfile or requirements.txt was changed
        id: check_dependencies
        run: |
          if git diff --name-only "${{ github.event.workflow_run.outputs.branch }}" | grep -q -e 'Dockerfile' -e 'requirements.txt'; then
            echo "Dockerfile or requirements.txt changed"
            echo "::set-output name=updated::true"
          else
            echo "Dockerfile or requirements.txt not changed"
            echo "::set-output name=updated::false"
          fi

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v2
        if: steps.check_dependencies.outputs.updated == 'true'

      - name: Log in to DockerHub
        uses: docker/login-action@v2
        if: steps.check_dependencies.outputs.updated == 'true'
        with:
          username: ${{ secrets.DOCKERHUB_USERNAME }}
          password: ${{ secrets.DOCKERHUB_TOKEN }}

      - name: Build Docker image
        if: steps.check_dependencies.outputs.updated == 'true'
        run: docker build -t ${{ secrets.DOCKER_IMAGE }}:latest .

      - name: Push Docker image
        if: steps.check_dependencies.outputs.updated == 'true'
        run: docker push ${{ secrets.DOCKER_IMAGE }}:latest