fix: fix repository root detection

[linrongbin16]

Fix #231 .

Regression Test

Platforms

• windows
• macOS
• linux

Hosts

• Test on github.com.
• Test on gitlab.com.
• Test on bitbucket.org.
• Test on codeberg.org.
• Test on git.samba.org.

Functions

• Use GitLink(!) to copy git link (or open in browser).
• Use GitLink(!) blame to copy the /blame link (or open in browser).
• Use GitLink(!) default_branch to open the /main//master link in browser (or open in browser).
• Use GitLink(!) current_branch to open the current branch link in browser (or open in browser).
• Copy git link in a symlink directory of git repo.
• Copy git link in an un-pushed git branch, and receive an expected error.
• Copy git link in a pushed git branch but edited file, and receive a warning says the git link could be wrong.

[linrongbin16]

At last, this issue is fixed by adding the cwd options when calling all the git commands, this is the most correct solution.

The cwd is using the directory of current buffer/file that user is editing, if there's no buffer/file, it fallbacks to the real CWD/PWD that user's Neovim is working at.

[codecov]

Codecov Report

Attention: Patch coverage is 75.55556% with 11 lines in your changes are missing coverage. Please review.

Project coverage is 76.54%. Comparing base (69bafe6) to head (155a3c2).

Files	Patch %	Lines
lua/gitlinker/git.lua	73.91%	6 Missing ⚠️
lua/gitlinker/linker.lua	77.27%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #232      +/-   ##
==========================================
+ Coverage   73.61%   76.54%   +2.92%     
==========================================
  Files           9        9              
  Lines         815      827      +12     
==========================================
+ Hits          600      633      +33     
+ Misses        215      194      -21     

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