buildah-build/.github/workflows/dockerfile_build.yml

# This workflow will perform a test whenever there
# is some change in code done to ensure that the changes
# are not buggy and we are getting the desired output.
name: Build from dockerfile
on:
  push:
  pull_request:
  workflow_dispatch:
  schedule:
    - cron: '0 0 * * *'  # every day at midnight

env:
  IMAGE_NAME: "hello-world"

jobs:
  build:
    name: Build image using Buildah
    runs-on: ubuntu-20.04
    strategy:
      fail-fast: false
      matrix:
        install_latest: [ true, false ]

    steps:
      - name: Install latest buildah
        if: matrix.install_latest
        # https://github.com/containers/buildah/blob/main/install.md
        run: |
          . /etc/os-release
          sudo sh -c "echo 'deb http://download.opensuse.org/repositories/devel:/kubic:/libcontainers:/stable/x${ID^}_${VERSION_ID}/ /' > /etc/apt/sources.list.d/devel:kubic:libcontainers:stable.list"
          wget -nv https://download.opensuse.org/repositories/devel:kubic:libcontainers:stable/x${ID^}_${VERSION_ID}/Release.key -O Release.key
          sudo apt-key add - < Release.key
          sudo apt-get update -qq
          sudo apt-get -qq -y install buildah          

      # Checkout buildah action github repository
      - name: Checkout Buildah action
        uses: actions/checkout@v2
        with:
          path: "buildah-build"

      - name: Create Dockerfile
        run: |
          cat > Dockerfile<<EOF
          FROM busybox
          RUN echo "hello world"
          EOF          

      # Build image using Buildah action
      - name: Build Image
        id: build_image
        uses: ./buildah-build/
        with:
          image: ${{ env.IMAGE_NAME }}
          layers: false
          tags: 'latest ${{ github.sha }}'
          dockerfiles: |
            ./Dockerfile            
          extra-args: |
            --pull            

      - name: Echo Outputs
        run: |
          echo "Image: ${{ steps.build_image.outputs.image }}"
          echo "Tags: ${{ steps.build_image.outputs.tags }}"          

      # Check if image is build
      - name: Check images created
        run: buildah images | grep '${{ env.IMAGE_NAME }}'