privsec.dev/.github/workflows/firebase-hosting-pull-request.yml

name: Deploy to Firebase Hosting on PR
on:
  workflow_run:
    workflows: ["Build Hugo site on PR"]
    types:
      - completed

jobs:
  Preview:
    runs-on: ubuntu-latest
    if: >
      ${{ github.event.workflow_run.event == 'pull_request' &&
      github.event.workflow_run.conclusion == 'success' }}      
    steps:
      - name: Download artifact
        uses: actions/github-script@v3.1.0
        with:
          script: |
            var artifacts = await github.actions.listWorkflowRunArtifacts({
               owner: context.repo.owner,
               repo: context.repo.repo,
               run_id: ${{github.event.workflow_run.id }},
            });
            var matchArtifact = artifacts.data.artifacts.filter((artifact) => {
              return artifact.name == "hugo"
            })[0];
            var download = await github.actions.downloadArtifact({
               owner: context.repo.owner,
               repo: context.repo.repo,
               artifact_id: matchArtifact.id,
               archive_format: 'zip',
            });
            var fs = require('fs');
            fs.writeFileSync('${{github.workspace}}/hugo.zip', Buffer.from(download.data));            

      - name: Unzip artifact
        run: unzip hugo.zip

      - name: Remove artifact zip
        run: rm hugo.zip

      - name: Deploy to Firebase
        uses: FirebaseExtended/action-hosting-deploy@v0
        with:
          repoToken: '${{ secrets.GITHUB_TOKEN }}'
          firebaseServiceAccount: '${{ secrets.FIREBASE_SERVICE_ACCOUNT_PRIVSEC_356523 }}'
          projectId: privsec-356523