GitHub action to automatically rebase PRs

After installation simply comment /rebase or /autosquash or rebase+ to trigger the action:

Commands description

• /rebase - Rebase PR branch on the HEAD of the base
• /autosquash - Autosquash the PR without rebasing on the base branch
• /rebase+ - Rebase PR branch on the HEAD of the base and autosquash commits

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/Autosquash
jobs:
  rebase:
    name: Rebase
    if: github.event.issue.pull_request != '' && (contains(github.event.comment.body, '/rebase') || contains(github.event.comment.body, '/autosquash') || contains(github.event.comment.body, '/rebase+'))
    runs-on: ubuntu-latest
    steps:
    - name: Checkout the latest code
      uses: actions/checkout@v3
      with:
        fetch-depth: 0
    - name: Rebase/Autosquash
      uses: wandera/rebase@master
      env:
        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

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.