git status-related fixes

[mark-dr]

Two fixes for changes in #12:

1. Use path.join to construct a path (this was failing on POSIX systems)
2. Avoid calling git status altogether if user has set ignoreGitStatus. I was getting failures in my monorepo project due to it interpreting my package dir as the Git dir. I'm not sure why it passes --git-dir to git status (could just set the exec's cwd to match dir?), but this change means that passing ignoreGitStatus allows users in situations like mine to bypass the issue entirely.

[mark-dr]

@danay1999, pinging you since this PR changes some of your work from #12. Could I get you to have a look, or to assign some reviewers? 🙂

[akwodkiewicz]

Not a maintainer, but looks good.

[bennycode]

I can confirm that the path.join(dirPath, ".git") fix is very important. I am using Windows 11 in combination mit WSL2 / Ubuntu. When running the ts-fix without the fix from this PR, I am getting to see the following error:

Error: Command failed: git --git-dir="/home/bennycode/dev/my-project.git" --work-tree="/home/bennycode/dev/bennycode/trading212-api" status --porcelain

fatal: not a git repository: '/home/bennycode/dev/my-project\.git'

It's because of the mix of / and \ in the file path. Using path.join fixes this inconsistency.

@jakebailey and @andrewbranch: Can you have a look at this?