publishImage.yml

name: Publish Docker image to Dockerhub and GHCR

on:
  push:
    branches:
      - 'main'
      # add additional branches that should build to images here
      # they will be tagged based on the branch name IE kener:test
      #- 'test'
    tags:
      - '*.*.*'
    # don't trigger if just updating docs
    paths-ignore:
      - 'docs.md'
      - 'README.md'

jobs:
  push_to_registry:
    name: Push Docker image to Docker Hub
    runs-on: ubuntu-latest
    # only run if we've specified image tag to push to
    if: ${{ vars.DOCKERHUB_IMAGE_NAME != '' ||  vars.GHCR_IMAGE_NAME != '' }}
    # https://docs.github.com/en/actions/security-guides/automatic-token-authentication#permissions-for-the-github_token
    permissions:
      packages: write
      contents: read
    steps:
      - name: Check out the repo
        uses: actions/checkout@v2

      - name: Log in to Docker Hub
        if: ${{ github.event_name != 'pull_request' && vars.DOCKERHUB_IMAGE_NAME != '' }}
        uses: docker/login-action@v2
        with:
          username: ${{ secrets.DOCKER_USERNAME }}
          password: ${{ secrets.DOCKER_PASSWORD }}

      - name: Login to GitHub Container Registry
        if: ${{ github.event_name != 'pull_request' && vars.GHCR_IMAGE_NAME != '' }}
        uses: docker/login-action@v2
        with:
          registry: ghcr.io
          username: ${{ github.repository_owner }}
          password: ${{ secrets.GITHUB_TOKEN }}
      
      - name: Extract metadata (tags, labels) for Docker
        id: meta
        uses: docker/metadata-action@v3
        with:
          images: |
            ${{ vars.DOCKERHUB_IMAGE_NAME }}
            ${{ vars.GHCR_IMAGE_NAME }}
          # generate Docker tags based on the following events/attributes
          tags: |
            type=raw,value=latest,enable=${{ endsWith(github.ref, 'main') }}
            type=ref,event=branch,enable=${{ !endsWith(github.ref, 'main') }}
            type=semver,pattern={{version}}
          flavor: |
            latest=false

      - name: Set up QEMU
        uses: docker/setup-qemu-action@v2

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v2

      - name: Build and push Docker image
        uses: docker/build-push-action@v4
        with:
          context: .
          push: ${{ github.event_name != 'pull_request' && !env.ACT}}
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}
          platforms: linux/amd64