deploy_preview.yml

name: Deploy preview

on:
  workflow_run:
    worflows: ["Build preview"]
    types: [completed]

jobs:
  deploy:
    runs-on: ubuntu-latest
    if: ${{ github.event.workflow_run.conclusion == 'success' }}
    steps:
      - uses: actions/checkout@v4
      - uses: actions/download-artifact@v4
        with:
          name: client
          path: dist/min
          github-token: "${{ secrets.GITHUB_TOKEN }}"
          run-id: "${{ context.payload.workflow_run.id }}"
      - name: Get PR ID
        # https://github.com/orgs/community/discussions/25220#discussioncomment-7532132
        id: pr-id
        run: |
          PR_ID=$(gh run view -R ${{ github.repository }} ${{ github.event.workflow_run.id }} | grep -oP '#[0-9]+ . ${{ github.event.workflow_run.id }}' | grep -oP '#[0-9]+' | cut -c 2-)
          echo "pr-id=${PR_ID}" >> $GITHUB_OUTPUT
      - uses: FirebaseExtended/action-hosting-deploy@v0
        id: deploy
        with:
          repoToken: "${{ secrets.GITHUB_TOKEN }}"
          firebaseServiceAccount: "${{ secrets.FIREBASE_HOSTING_SERVICE_ACCOUNT_KEY }}"
          expires: 30d
          channel: "pr${{ steps.pr-id.outputs.pr-id }}"
          projectId: neuroglancer-demo
      - name: "Comment on PR"
        uses: actions/github-script@v7
        with:
          github-token: ${{ secrets.GITHUB_TOKEN }}
          script: |
            const issueNumber = ${{ steps.pr-id.outputs.pr-id }};
            const MESSAGE_START = "\n\n<!-- Firebase hosting preview start -->\n";
            const MESSAGE_END = "\n<!-- Firebase hosting preview end -->\n";
            const message = `----
            🔥 Preview 🔥: ${{ steps.deploy.outputs.details_url }}
            Updated at ${Date.now()} for commit ${{ github.event.workflow_run.head_commit.id }}
            Expires: ${{ steps.deploy.outputs.expire_time }}
            `;
            const { data: pull } = await github.rest.pulls.get({
              owner: context.repo.owner,
              repo: context.repo.repo,
              pull_number: issueNumber,
            });
            let body = "";
            if (pull.body && pull.body.includes(MESSAGE_SEPARATOR_START)) {
              body = pull.body.slice(0, pull.body.indexOf(MESSAGE_SEPARATOR_START));
              body = body + MESSAGE_SEPARATOR_START + message + MESSAGE_SEPARATOR_END;
              body = body + pull.body.slice(pull.body.indexOf(MESSAGE_SEPARATOR_END) + MESSAGE_SEPARATOR_END.length);
            } else {
              body = MESSAGE_SEPARATOR_START + message + MESSAGE_SEPARATOR_END;
            }
            github.rest.pulls.update({
                owner: context.repo.owner,
                repo: context.repo.repo,
                pull_number: context.issue.number,
                body: body,
            });