pull_request_post_processor.yml

name: Comment on pull request post procesing
# depends on and only executes after pull_request_processor.yml is complete

on: 
  workflow_run:
    workflows: ["Pull Request Processor"]
    types:
      - completed

jobs:
  one:
    runs-on: ubuntu-latest
    strategy:
      matrix:
        python-version: [3.8]
    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: ${{github.event.workflow_run.id }},
            });
            var matchArtifact = artifacts.data.artifacts.filter((artifact) => {
              return artifact.name == "prcontext"
            })[0];
            var download = await github.actions.downloadArtifact({
               owner: context.repo.owner,
               repo: context.repo.repo,
               artifact_id: matchArtifact.id,
               archive_format: 'zip',
            });
            var fs = require('fs');
            fs.writeFileSync('${{github.workspace}}/pr.zip', Buffer.from(download.data));
      - run: unzip pr.zip

      - name: Print github contexts
        env:
          GITHUB_CONTEXT: ${{ toJSON(github) }}
        run: |
          ls
          echo "GH context:"
          echo "$GITHUB_CONTEXT"
      
      - name: 'Comment on PR'
        uses: actions/github-script@v3
        with:
          github-token: github.token
          script: |
            var fs = require('fs');
            var issue_number = Number(fs.readFileSync('./PRNumber'));
            await github.issues.createComment({
              owner: context.repo.owner,
              repo: context.repo.repo,
              issue_number: issue_number,
              body: 'Everything is OK. Thank you for the PR!'
            });