build-minimal-runner-image.yml

name: Build Minimal Runner Image

on:
  workflow_dispatch:
  pull_request:
    paths:
      - '.github/workflows/build-minimal-runner-image.yml'
      - '.github/minimal-runner-image/**'

permissions:
  contents: read
  packages: write

jobs:
  build-and-upload-minimal-image:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout
        uses: actions/checkout@v4

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@a530e948adbeb357dbca95a7f8845d385edf4438 # v3

      - name: Login to GHCR
        uses: docker/login-action@5f4866a30a54f16a52d2ecb4a3898e9e424939cf # v3
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Determine TAG
        id: tag
        run: |
         echo "TAG=$(cat ${{ github.workspace }}/.github/minimal-runner-image/TAG)" >> $GITHUB_ENV

      - name: Build and push image
        uses: docker/build-push-action@eb539f44b153603ccbfbd98e2ab9d4d0dcaf23a4 # v5
        with:
          context: ${{ github.workspace}}/.github/minimal-runner-image
          push: true
          tags: |
            ghcr.io/${{ github.repository_owner }}/minimal-runner-image:${{ env.TAG }}
            ghcr.io/${{ github.repository_owner }}/minimal-runner-image:latest