Bitbucket pipeline to sync / copy code commits to GitHub. How to sync Bitbucket repo to GitHub

bitbucket-pipelines.yml

image: alpine/git:1.0.26 
  
definitions:
  services:
    docker:
      memory: 1024
  
  steps:
    - step: &Push-to-GitHub
        name: Push code changes to GitHub
        services:
          - docker
        caches:
          - docker
        script:
          - git remote add github "git@github.com:[yourname]/[your repo].git"
          - git checkout $BITBUCKET_BRANCH
          - git pull
          - git push github $BITBUCKET_BRANCH

pipelines:
  branches:
    master:
      - step: *Push-to-GitHub
    sandbox:
      - step: *Push-to-GitHub              
    staging:
      - step: *Push-to-GitHub              
    production:
      - step: *Push-to-GitHub  

It needs to generate SSH key pair in your BitBucket account and to register the public ssh key in your GitHub repo settings as Deployment key ( set [x] for write access)