mirror.yml

# Used for creating mirror images of images currently on docker.io.
# The main reason is to circumvent the docker pull rate-limit
# Currently this is used for:
# Alpine (used in Dockerfile for base image)

name: mirror-images
on:
  workflow_dispatch:
    inputs:
      tag:
        description: 'The tag of the docker.io/alpine image that is mirrored as ghcr.io/mailu/alpine'
        required: true
        type: string

jobs:
# mirror alpine image
  mirror-image-alpine:
    runs-on: ubuntu-latest
    steps:
      - name: Helper to convert docker org to lowercase
        id: string
        uses: ASzc/change-string-case-action@v5
        with:
          string: ${{ github.repository_owner }}
      - name: Mirror images
        shell: bash
        env:
          DOCKER_ORG: ghcr.io/${{ steps.string.outputs.lowercase }}
          TAG: ${{ inputs.tag }}
        run: |
          set -euxo pipefail \
          ; echo "${{ github.token }}" | docker login --username "${{ github.repository_owner }}" --password-stdin ghcr.io \
          ; curl -L https://github.com/regclient/regclient/releases/latest/download/regctl-linux-amd64 >regctl \
          ; chmod 755 regctl \
          ; ./regctl image copy docker.io/alpine:"$TAG" "$DOCKER_ORG"/alpine:"$TAG" \
          ; rm regctl \
          ; docker logout ghcr.io