exemplo básico de como configurar automatização de PR no workflow do GitHub Actions:

workflow-gh-actions.yaml

name: Automatizar PR da Develop para Main

on:
  push:
    branches:
      - develop

jobs:
  create-pr:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v2

      - name: Abrir Pull Request
        uses: repo-sync/pull-request@v2
        with:
          destination_branch: "main"
          github_token: ${{ secrets.GITHUB_TOKEN }}
          pr_title: "Atualização da Main"
          pr_body: "Merge automático da branch Develop para Main."

      - name: Merge automático
        uses: pascalgn/automerge-action@v0.14.3
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
          MERGE_LABELS: "automerge,!wip"
          MERGE_METHOD: "merge"
          MERGE_COMMIT_MESSAGE: "Merge automático via GitHub Actions"
          MERGE_RETRIES: "6"
          MERGE_RETRY_SLEEP: "10000"