docker-image.yml

# The purpose of this GitHub Action is to build & push the docker container
# Once built, the container will be pushed to GitHub Contariner Registry, and then DockerHub

name: Create and publish a Docker image

on:
  push:

env:
  REGISTRY_GITHUB: ghcr.io
  REGISTRY_DOCKERHUB: docker.io
  IMAGE_NAME: ${{ github.repository }}

jobs:
  build-and-push-image:
    runs-on: ubuntu-latest
    permissions:
      contents: read
      packages: write

    steps:
      - name: Checkout repository
        uses: actions/checkout@v4

      - name: Log in to the GHCR
        uses: docker/login-action@v3
        with:
          registry: ${{ env.REGISTRY_GITHUB }}
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

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


      - name: Build and push Docker image to GitHub
        uses: docker/build-push-action@v5
        with:
          push: true
          tags: ${{ steps.meta-ghcr.outputs.tags }}
          labels: ${{ steps.meta-ghcr.outputs.labels }}
      
      - name: Log in to DockerHub
        uses: docker/login-action@v3
        with:
          username: ${{ secrets.DOCKERHUB_USER }}
          password: ${{ secrets.DOCKERHUB_PASSWORD }}

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

      - name: Build and push Docker image to DockerHub
        uses: docker/build-push-action@v5
        with:
          push: true
          tags: ${{ steps.meta-dh.outputs.tags }}
          labels: ${{ steps.meta-dh.outputs.labels }}