Repositories with git-dir and work-dir should't create .git file in working directory

Reproduction steps

Repository.Init("/working/path", "/git/path");

Expected behavior

For most cases the whole point of doing this separation of working directory and git directory is to avoid the existence of .git file/folder in working directory

Actual behavior

The repo_is_worktree in repository.c of libgit2, should not checking for gitdir in working directory.
In config file, in git directory there is a field worktree = /working/path which could be used to find out which is the working directory.

My suggestion would be, in private Repository constructor to get the worktree value from config file in git-directory and pass it to the Proxy.git_repository_set_workdir in Repository class
instead of reading the value from options that were given from caller.
Future improvement would be not event passing the working directory, because it can be extracted from config file.

Hope to hear soon your opinion on this
Max

從 Repository.Init 和私有的 Repository 建構函式開始，接著檢查 Proxy.git_repository_set_workdir 附近的 Repository.cs。將該路徑與 src/repository.c 中的 repo_is_worktree 和 gitdir 處理進行比較，並如描述使用 Git 目錄設定中的 worktree 值。使用分離的工作路徑和 Git 路徑重現此問題，並確認初始化不再在工作目錄中建立 .git 檔案。