# Reusable workflow, callable from other repos, to build and possibly push a
# container image. The container must contain a file /tag which contains the
# desired image tag.

on:
  workflow_call:
    inputs:
      image_name:
        description: Image name, like docker.io/me/my_image
        required: true
        type: string
      push:
        description: True if the image should be pushed after building
        required: false
        default: false
        type: boolean
jobs:
  build:
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@v4
    - name: Install Docker
      run: curl -fsSL https://get.docker.com | sh
    - name: build
      run: docker build -t ${{ inputs.image_name }}:${{ github.run_number }}
    - name: push
      if: ${{ inputs.push }}
      run: |
        docker create --name ${{ inputs.image_name }}_${{ github.run_number }} ${{ inputs.image_name }}:${{ github.run_number }}
        docker export -o /tmp/image ${{ inputs.image_name }}_${{ github.run_number }}
        docker rm ${{ inputs.image_name }}_${{ github.run_number }}
        docker rmi ${{ inputs.image_name }}:${{ github.run_number }}
        tar -x -C /tmp -f /tmp/image tag
        tag=$(cat /tmp/tag)
        docker tag ${{ inputs.image_name }}:${{ github.run_number }} ${{ inputs.image_name }}:$tag
        docker push ${{ inputs.image_name }}:$tag