* Make git add work consistently with subdirectories
Currently, depending on your `commitMode`,
when running the action with `cwd` set to a subdirectory of a repo,
the action will either:
- `git-cli`: add the files changed in the subdirectory only
- `github-api`: add files changed anywhere in the repository
This commit brings github-api in line with git-cli,
so that it only adds files in the current working directory.
* Explicitly set `cwd` for all exec calls
* Avoid using `ExecOptions` from `@actions/exec`
* Rename type
* remove redundant `filter`
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Co-authored-by: Mateusz Burzyński <mateuszburzynski@gmail.com>
