Support git push options (maybe w/ special handling for. ci.skip)

GitLab uses git "push options" to allow CI to be skipped for a specific push. We push the same commit to multiple branches and use the git push option when we don't want CI to be run. Putting a CI skip in our commit message would not work because we want CI to run for some of our pushes, and because with our use cases, CI skip would not make sense to have stay in our commit history.

The ability to check a box when I am doing a push to specify that I want to skip CI for that push would be awesome.

I don't care about any other git push options right now, but it might be worth considering that people might come up with new & useful ways to use git push options over time.