gn-guile: Disambiguate the working dir from the "remote" repo.

The assumption (before this commit) was that the bare/remote
repository from which we'd clone the working repository was exposed to
the container as a directory. The parent of that directory doubled as
the working directory for the application.

This conflation of purposes is wrong, and leads to problems, since the
remote repo could be a URL/URI to an external service. This commit
explicitly defines the working directory.

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