Function push_branch 

pub fn push_branch(branch: &str) -> Result<PushResult>

Push the current branch to origin with upstream tracking

Uses git push --set-upstream origin <branch> to push the branch and set up tracking. If the branch already exists on remote, it will still push any new commits.

Arguments

• branch - The branch name to push

Returns

• PushResult::Success - Push completed successfully
• PushResult::AlreadyUpToDate - Branch is already up-to-date
• PushResult::Error(msg) - Push failed with error message