Allow pushing branches to forks

[vyasr]

Describe the solution you'd like
I contribute to various repositories where the development model involves forking a repo, pushing to the fork, and then making a PR back to the parent repo. In this situation my forked repo's main branch is rarely up-to-date because the local main branch is pointing to the parent repo's version of the branch, i.e. locally I have main -> upstream/main and origin/main lags arbitrarily far behind upstream/main. In those scenarios, I would like to be able to point git-xargs to push my new branch to a different repo than the repository from which it was cloned. I envision something like:

git-xargs \
  --branch-name test-branch \
  --repo parent/repo \
  --push-repo forked/repo \
  --commit-message "Create hello-world.txt" \
  touch hello-world.txt

Apologies in advance if there's a way to do this that I'm missing! I've read through the README and glanced through issues, and don't see anything similar discussed anywhere.

Describe alternatives you've considered
Keeping the main branch on my forks would partially address this problem by ensuring that I am making changes from the same state as the parent repo. However, you would still need a way for the created PRs to point back to the parent repo rather than the main branch on the fork, which IIUC requires some additional information no matter what.

Additional context
None

[lindell]

This is (at least partially) supported in a similar project that I maintain called multi-gitter, please check it out and see if it would solve your problem.