Deploy Documentation Preview.yml

# Inspiration: https://github.com/ACCESS-Hive/access-hive.github.io/pull/126
# For security, we do not want to checkout and run code from forks (could lead to secrets being leaked)
# So split documentation build/preview into discrete steps

name: Deploy documentation preview

# If the documentation build completed successfully, then download the generated artifact
# and upload it to github pages
on:
  workflow_run:
    workflows: ["Build Documentation preview"]
    types:
      - completed

concurrency:
  group: preview-${{ github.ref }}
  cancel-in-progress: true

jobs:
  deploy-preview:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      # Will download all artifacts
      # If artifact name == preview_site, then we have a site to reply
      # If artifact name == closed_pr_number, then we need to cleanup an old deployment
      - name: Download artifacts
        uses: dawidd6/action-download-artifact@v5
        with:
          run_id: ${{github.event.workflow_run.id }}
          path: ./artifacts
      - name: Check artifact name
        run: |
          if [ -d "./artifacts/preview_site" ]; then
            echo "mode=deploy" >> "$GITHUB_ENV"
          elif [ -d "./artifacts/closed_pr_number" ]; then
            echo "mode=clean" >> "$GITHUB_ENV"
          else
              echo "Failed to find artifact"
              exit 1
          fi
      # Get PR number
      - if: ${{ env.mode == 'deploy' }}
        name: Get PR number (deploy)
        run: echo "pr_number=$(cat ./artifacts/preview_site/.pr_number)" >> "$GITHUB_ENV"

      - if: ${{ env.mode == 'clean' }}
        name: Get PR number (clean)
        run: echo "pr_number=$(cat ./artifacts/closed_pr_number/.pr_number)" >> "$GITHUB_ENV"

      # Run deployment
      - if: ${{ env.mode == 'deploy' }}
        name: Deploy preview
        uses: access-nri/pr-preview-action@v2
        with:
          source-dir: ./artifacts/preview_site
          action: deploy
          pr-number: ${{ env.pr_number }}
      - if: ${{ env.mode == 'clean' }}
        name: Clean preview
        uses: access-nri/pr-preview-action@v2
        with:
          action: remove
          pr-number: ${{ env.pr_number }}