Support tox.ini in a subdirectory

[The-Compiler]

If I test with remote ssh (which is how I dev):

I have a little error toast that is displayed with the following message:
Command failed: tox -a ERROR: tox config file (either pyproject.toml, tox.ini, setup.cfg) not found.

For information, my tox.ini is not directly in the workspace directory but in a subdirectory

Originally posted by @cedlemo in #29 (comment)