review-app-comment.yml

name: Comment Review App URL

on:
  pull_request:
    types: [opened, synchronize]

permissions:
  pull-requests: write
  issues: write

jobs:
  comment:
    runs-on: ubuntu-latest
    steps:
      - name: Wait for Heroku deployment
        run: sleep 30

      - name: Comment PR with Review App URL
        uses: actions/github-script@v7
        with:
          script: |
            const prNumber = context.payload.pull_request.number;

            const comments = await github.rest.issues.listComments({
              owner: context.repo.owner,
              repo: context.repo.repo,
              issue_number: prNumber,
            });

            const botComment = comments.data.find(c =>
              c.body.includes('Review App Preview')
            );

            const body = `## 🔍 Review App Preview

A Heroku Review App is being deployed for this PR.

**View your preview:** Check the [Heroku Pipeline](https://dashboard.heroku.com/pipelines/kernelboard) for the review app URL.

> The review app may take a few minutes to build after pushing.`;

            if (botComment) {
              // Don't update if already commented
              return;
            }

            await github.rest.issues.createComment({
              owner: context.repo.owner,
              repo: context.repo.repo,
              issue_number: prNumber,
              body: body
            });