publish.yml

name: Publish a Docker Image

on:
  workflow_run:
    workflows: ["Release"]
    types: [completed]

env:
  REGISTRY: ghcr.io
  IMAGE_NAME: ${{ github.repository }}

jobs:
  build-and-push-image:
    runs-on: ubuntu-20.04
    permissions:
      contents: read
      packages: write

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

      - name: Fetch latest release version
        id: fetch-latest-release
        run: |
         latest_release=$(curl -Ls \
           -H "Accept: application/vnd.github+json" \
           -H "Authorization: Bearer ${{ secrets.GITHUB_TOKEN }}" \
           -H "X-GitHub-Api-Version: 2022-11-28" \
           $GITHUB_API_URL/repos/$GITHUB_REPOSITORY/releases/latest | jq --raw-output '.tag_name')
         echo "latest_release is $latest_release"
         echo "latest-release=$latest_release" >> $GITHUB_OUTPUT

      - name: Lowercase
        id: imagelc
        uses: ASzc/change-string-case-action@v5
        with:
          string: ${{ github.repository }}

      - name: Output
        run: |
          echo "released version is ${{ steps.fetch-latest-release.outputs.latest-release }}"
          echo "image name is ${{ steps.imagelc.outputs.lowercase }}"

      - name: Log in to the Container registry
        uses: docker/login-action@v2
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Extract metadata (tags, labels) for Docker
        id: meta
        uses: docker/metadata-action@v4
        with:
          images: ${{ env.REGISTRY }}/${{ steps.imagelc.outputs.lowercase }}

      - name: Build and Push Docker Image
        id: docker_build
        uses: docker/build-push-action@v4
        with:
          context: .
          push: true
          tags: ${{ env.REGISTRY }}/${{ steps.imagelc.outputs.lowercase }}:${{ steps.fetch-latest-release.outputs.latest-release }}
          labels: ${{ steps.meta.outputs.labels }}
          file: Dockerfile.redhat

      - name: Inspect
        run: |
          docker image inspect ${{ env.REGISTRY }}/${{ steps.imagelc.outputs.lowercase }}:${{ steps.fetch-latest-release.outputs.latest-release }}