GitHub Actions workflow to generate a list of merged pull requests and update pull requests.

merged-pr-diff.yml

name: Update merged pr diff

on:
  pull_request:
    branches:
      - main

jobs:
  update-merged-pr-diff:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
        with:
          fetch-depth: 0
      - name: Replace release diff
        uses: actions/github-script@60a0d83039c74a4aee543508d2ffcb1c3799cdea # v7.0.1
        with:
          github-token: ${{ secrets.GITHUB_TOKEN }}
          script: |
            const baseBranch = context.payload.pull_request.base.ref;
            const branchName = context.payload.pull_request.head.ref;
            const { execSync } = require('child_process');
            const logOutput = execSync(`git log --merges --pretty="%s" origin/${baseBranch}..origin/${branchName} | grep -oE \'#[0-9]+\' | sed \'s/#/- #/\'`).toString();
            const mergedPrsOutput = logOutput.replace(/\r\n/g, '\n');
            const body = context.payload.pull_request.body;
            const replacedBody = body.replace(/<!--pr_diff_start-->.*<!--pr_diff_end-->/s, `<!--pr_diff_start-->\n\n${mergedPrsOutput}\n<!--pr_diff_end-->`);
            github.rest.pulls.update({
              owner: context.repo.owner,
              repo: context.repo.repo,
              pull_number: context.issue.number,
              body: replacedBody
            });