name: CI image

# Builds the Arch image that ci.yml runs in, with the build dependencies preinstalled.
# Rebuilt weekly to pick up Arch updates.
on:
  push:
    branches: [main]
    paths: ['.gitea/ci-image/**', '.gitea/workflows/ci-image.yml']
  schedule:
    - cron: '0 3 * * 1'
  workflow_dispatch:

jobs:
  image:
    # The build runs on the runner's own Docker daemon, so the amd64 runner has the new
    # image locally right away. It does not re-pull tags it already has.
    runs-on: amd64
    env:
      IMAGE: git.trivk.dev/tri/qtpotato-ci:latest
    steps:
      - uses: actions/checkout@v4
      - name: Build
        # No layer cache, so each rebuild picks up the week's Arch updates.
        run: docker build --pull --no-cache -t "$IMAGE" .gitea/ci-image
      - name: Push
        # Gitea's Actions token cannot push to the container registry, so this uses an
        # access token with the write:package scope. Cloudflare rejects request bodies over
        # 100 MB and docker push sends each layer in one request, so regctl pushes the
        # layers in 50 MB chunks instead.
        env:
          TOKEN: ${{ secrets.PACKAGE_TOKEN }}
        run: |
          curl -fsSL -o /usr/local/bin/regctl \
              https://github.com/regclient/regclient/releases/download/v0.11.7/regctl-linux-amd64
          echo "3737fbbdd791e04e7a831640b681f3397a376498e80e2ad9b1b2d27296f239bc  /usr/local/bin/regctl" | sha256sum -c
          chmod +x /usr/local/bin/regctl
          echo "$TOKEN" | regctl registry login git.trivk.dev -u "${{ github.repository_owner }}" --pass-stdin
          regctl registry set git.trivk.dev --blob-chunk 52428800 --blob-max 52428800
          docker save "$IMAGE" -o "$RUNNER_TEMP/image.tar"
          regctl image import "$IMAGE" "$RUNNER_TEMP/image.tar"