size_report_comment.yml

name: Comment Build Size Report

on:
  workflow_run:
    workflows: ["Create Build Size Report"]
    types:
      - completed

jobs:
  comment_report:
    runs-on: ubuntu-latest
    if: >
      github.event.workflow_run.event == 'pull_request' &&
      github.event.workflow_run.conclusion == 'success'
    steps:
      - name: "Download size report artifact"
        uses: actions/github-script@v6
        with:
          script: |
            var artifacts = await github.rest.actions.listWorkflowRunArtifacts({
               owner: context.repo.owner,
               repo: context.repo.repo,
               run_id: ${{github.event.workflow_run.id }},
            });
            var matchArtifact = artifacts.data.artifacts.filter((artifact) => {
              return artifact.name == "size_report"
            })[0];
            var download = await github.rest.actions.downloadArtifact({
               owner: context.repo.owner,
               repo: context.repo.repo,
               artifact_id: matchArtifact.id,
               archive_format: 'zip',
            });
            var fs = require('fs');
            fs.writeFileSync('${{github.workspace}}/size_report.zip', Buffer.from(download.data));

      - run: unzip -d size_report size_report.zip

      - name: "Comment on PR"
        uses: actions/github-script@v6
        with:
          github-token: ${{ secrets.GITHUB_TOKEN }}
          script: |
            var fs = require('fs');
            var issue_number = Number(fs.readFileSync('./size_report/pull_req_nr'));
            var size_report = String(fs.readFileSync('./size_report/report.md'));
            await github.rest.issues.createComment({
              owner: context.repo.owner,
              repo: context.repo.repo,
              issue_number: issue_number,
              body: size_report
            });