propose a github workflow

[wenjing]

A workflow for everyone to follow

[ghost]

• Maintain a protected main branch
  • All changes must be committed to a feature branch
  • Use PR to merge into the main branch
  • PR must pass CI tests and be approved by a reviewer
  • Trigger CI automatically on PR and require status check before merging
• Track all tasks in GitHub issues
  • Helps track progress, current status, and helps avoid duplication of work
  • Regularly update status on active issues
  • Keep all discussion in the issues to simplify sharing and tracking