update-index.yml

name: Update index

on:
  push:
    branches:
      - main
  workflow_dispatch:

jobs:

  update-index:
    if: github.ref == 'refs/heads/main'
    runs-on: ubuntu-latest

    steps:
    - uses: actions/checkout@v4
      with:
        path: main

    - uses: actions/checkout@v4
      with:
        ref: 'gh-pages'
        path: 'gh-pages'
        token: ${{ secrets.PAT }}

    - name: Update static index
      env:
        REGISTRY_AUTH_FILE: /tmp/auth.json
      run: |
        export FILES="./main/repos/*"
        echo '{"Registry": "https://ghcr.io/","Results": []}' > ./gh-pages/index/static
        for f in $FILES ; do
          echo "Processing $f file..."
          cat ./gh-pages/index/static | jq --argjson container "$(cat $f)" '.Results += [ $container ]' > ./gh-pages/index/static
        done

    - name: Check for changes
      id: is-updated 
      run: |
        set -x
        git -C ./gh-pages status -s -uno
        cat ./gh-pages/index/static
        # Don't let the file be empty
        [ ! -s ./gh-pages/index/static ] || [ -z "$(git -C ./gh-pages status -s -uno)" ] || echo "updated=true" >> $GITHUB_OUTPUT

    - name: Push to repository
      if: steps.is-updated.outputs.updated
      run: |
        git config --global user.name 'github-actions[bot]'
        git config --global user.email 'github-actions[bot]@users.noreply.github.com'
        git -C gh-pages commit -am "Update index"
        git -C gh-pages push