name: Docker Image Downloader

on:
  workflow_dispatch: # 수동 실행 버튼 활성화

jobs:
  download:
    runs-on: ubuntu-latest
    steps:
      - name: Docker Image Pull
        run: |
          # 빌드(build) 하지 않고 이미지를 바로 가져옵니다
          docker pull prom/prometheus:latest
          
      - name: Docker Image Save
        run: |
          # 가져온 이미지를 tar 파일로 압축합니다
          docker save prom/prometheus:latest -o prometheus.tar
          
      - name: Upload to GitHub Artifacts
        uses: actions/upload-artifact@v4
        with:
          name: prometheus-tar-file
          path: prometheus.tar
          retention-days: 1