在不應該開發的分支，進行了開發，並且進行了commit和push.
回滾：
git branch
# error_branch
git branch new_branch_for_backup
git reset --hard commit_id
git push origin:error_branch
git checkout right_branch
git merge new_branch_for_backup
git branch -d new_branch_for_backup
git push
參考：