...
Pentaho has no special procedures for working with our GitHub repositories. Follow the general workflow and instruction on GitHub: Git Bash Script
https://help.github.com/
When you're ready to submit code with a Pull Request, create a Jira case and use the case number in your commit messages, e.g. "[JIRA-1234] adding new functionality". When submitted update the Jira case with a link to the pull request on GitHub.
If you require assistance in keeping your local repositories up to date or updating them before committing, use the script found on the following page: Git Bash Script