GitHub action to automatically merge the base branch into the current PR

After installation simply comment /update to trigger the action:

Installation

To configure the action simply add the following lines to your .github/workflows/rebase.yml workflow file:

on: 
  issue_comment:
    types: [created]
name: Automatic Rebase
jobs:
  update:
    name: update
    if: github.event.issue.pull_request != '' && contains(github.event.comment.body, '/rebase')
    runs-on: ubuntu-latest
    steps:
    - name: Checkout the latest code
      uses: actions/checkout@v2
      with:
        fetch-depth: 0
        token: ${{ secrets.PAT }} # needed if you want the merge commit to trigger other workflows in your PR.
    - name: Automatic Sync
      uses: ankitvgupta/[email protected]
      env:
        GITHUB_TOKEN: ${{ secrets.PAT }} # needed if you want the merge commit to trigger other workflows in your PR.

Restricting who can call the action

It's possible to use author_association field of a comment to restrict who can call the action and skip the rebase for others. Simply add the following expression to the if statement in your workflow file: github.event.comment.author_association == 'MEMBER'. See documentation for a list of all available values of author_association.