pull_request_comment.yaml

name: PR Comment

on:
  workflow_run:
    workflows: ["Build"]
    types: [completed]

jobs:
  comment:
    runs-on: ubuntu-latest
    if: github.event.workflow_run.event == 'pull_request' && github.event.workflow_run.conclusion == 'success'
    permissions:
      pull-requests: write
      actions: read
    steps:
    - name: Download PR info
      uses: actions/download-artifact@v4
      with:
        name: pr-info
        path: pr-info
        run-id: ${{ github.event.workflow_run.id }}
        github-token: ${{ secrets.GITHUB_TOKEN }}

    - name: Comment PR with artifact links
      uses: actions/github-script@v7
      with:
        script: |
          const fs = require('fs');
          const prNumber = parseInt(fs.readFileSync('pr-info/number', 'utf8').trim());
          const headSha = fs.readFileSync('pr-info/head_sha', 'utf8').trim();
          const mergeSha = fs.readFileSync('pr-info/merge_sha', 'utf8').trim();
          const baseRef = fs.readFileSync('pr-info/base_ref', 'utf8').trim();
          const version = fs.readFileSync('pr-info/version', 'utf8').trim();
          const jobStart = parseInt(fs.readFileSync('pr-info/job_start', 'utf8').trim());
          const jobEnd = parseInt(fs.readFileSync('pr-info/job_end', 'utf8').trim());

          const runId = ${{ github.event.workflow_run.id }};
          const durationSec = jobEnd - jobStart;
          const durationMin = Math.floor(durationSec / 60);
          const durationRemSec = durationSec % 60;
          const duration = `${durationMin}m ${durationRemSec}s`;

          const { data: artifacts } = await github.rest.actions.listWorkflowRunArtifacts({
            owner: context.repo.owner,
            repo: context.repo.repo,
            run_id: runId
          });

          const artifactNames = fs.readFileSync('pr-info/artifacts', 'utf8').trim().split('\n');
          const buildArtifacts = artifacts.artifacts.filter(a => artifactNames.includes(a.name));
          const artifactLines = buildArtifacts.map(a => {
            const url = `https://github.com/${{ github.repository }}/actions/runs/${runId}/artifacts/${a.id}`;
            const size = (a.size_in_bytes / 1024 / 1024).toFixed(2);
            return `| [\`${a.name}\`](${url}) | ${size} MB |`;
          }).join('\n');

          const prHeadSha = headSha.substring(0, 7);
          const mergeCommitSha = mergeSha.substring(0, 7);

          const body = [
            '## ✅ Build Artifacts',
            '',
            `**Version:** \`${version}\``,
            `**Build:** \`${mergeCommitSha}\` (merge of [${prHeadSha}](https://github.com/${{ github.repository }}/commit/${headSha}) into \`${baseRef}\`)`,
            `**Duration:** ${duration}`,
            '',
            '| Artifact | Size |',
            '|----------|------|',
            artifactLines,
            '',
            `[View workflow run](https://github.com/${{ github.repository }}/actions/runs/${runId})`
          ].join('\n');

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