push-docker-image.yml

name: Create and publish a Docker image

on:
  push:
    branches: ['main']

env:
  REGISTRY: ghcr.io
  REPO_NAME: ${{ github.repository }}
  DOCKER_SLIM_VERSION: 1.40.11

jobs:
  build-and-push-image:
    runs-on: ubuntu-latest

    permissions:
      contents: read
      packages: write

    steps:
      - name: Set docker image env var
        run: |
          echo "IMAGE_NAME=${{ env.REGISTRY }}/${{ env.REPO_NAME }}:${{ env.DOCKER_SLIM_VERSION }}" >> $GITHUB_ENV

      - name: Checkout repository
        uses: actions/checkout@v3

      - name: Login to GitHub Container Registry
        uses: docker/login-action@v2
        with:
          registry: ghcr.io
          username: ${{ secrets.DOCKER_USERNAME }}
          password: ${{ secrets.DOCKER_TOKEN }}

      - name: Build and push Docker image
        uses: docker/build-push-action@v4
        with:
          context: .
          build-args: |
            "DOCKER_SLIM_VERSION=${{ env.DOCKER_SLIM_VERSION }}"
          push: true
          tags: ${{ env.IMAGE_NAME }}

      - name: Make a Slim image
        uses: kitabisa/docker-slim-action@v1
        env:
          DSLIM_HTTP_PROBE: false
        with:
          target: ${{ env.IMAGE_NAME }}
          tag: "${{ env.DOCKER_SLIM_VERSION }}-slim"

      # Push to the registry
      - run: docker push ${{ env.IMAGE_NAME }}-slim