gh "base repository" not worktree specific

gh version 1.0.0 (2020-09-16)

Setup: a "bare" git repository with multiple remotes and multiple git worktrees. For example: both https://github.com/llvm/llvm-project and https://github.com/apple/llvm-project

Problem: Unlike similar git workflows, `gh` asks the user to pick a "base repository" which is tied to the bare repository, not branches nor worktrees.

Workaround: create a wrapper around `gh` that tries to set `GH_REPO` as needed. In short, the script will extract the GitHub URL from git and pass it to gh: `git config remote.$(git config branch.$(git branch --show-current).remote).url`

Finally, and unless I missed something, the "base repository" feature seems undocumented.