GitHub Action - Duplicates default main branch to the old master branch

copy-branch.yml

# Duplicates default main branch to the old master branch

name: Duplicates main to old master branch

# Controls when the action will run. Triggers the workflow on push or pull request
# events but only for the main branch
on:
  push:
    branches: [ main ]

# A workflow run is made up of one or more jobs that can run sequentially or in parallel
jobs:
  # This workflow contains a single job called "copy-branch"
  copy-branch:
    # The type of runner that the job will run on
    runs-on: ubuntu-latest

    # Steps represent a sequence of tasks that will be executed as part of the job
    steps:
    # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it,
    # but specifies master branch (old default).
    - uses: actions/checkout@v2
      with:
        fetch-depth: 0
        ref: master
        
    - run: |
        git config user.name github-actions
        git config user.email github-actions@github.com
        git merge origin/main
        git push