Enable git-repo-path to choose its source directory.

[titanlien]

• git-repo-path is storing directory .gitsecret

[kerren]

@titanlien what would a use case for this be? Is it when you have a submodule?

[kerren]

I think we should probably make a change here in terms of the description?

[titanlien]

@titanlien what would a use case for this be? Is it when you have a submodule?

When we use actions/checkout@v4 image like the following setting. Then this image can't find its checkout secrets-directory directory.

      - name: Git clone the secrets repository
        uses: actions/checkout@v4
        with:
          repository: secrets-repo
          ref: ...
          token: ...
          path: secrets-directory