There are currently 3 ways LFS knows which remote to push to:

1. Commands receive it explicitly through a --remote arg or stdin input.
2. branch.*.remote (added recently in Tracked remote #2700)
3. Only remote, if there is only 1 configured remote.
4. origin.

Proposed changes:

• Support branch.*.pushRemote (docs)
• Support remote.pushDefault: Overrides branch.<name>.remote for all branches, and is overridden by branch.<name>.pushRemote for specific branches (docs)