Add Git push option to set visibility while using "Push to create project" feature
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## Problem to solve
Right now, projects created by pushes have private visibility. Can we somehow use [Git's push options](https://git-scm.com/docs/git-push/2.11.1#git-push---push-option) to set the visibility, so that users need not leave the terminal?
## Proposal
Add another push option to specify the project visibility.
issue