Add support for working-directory inputs

[almightychang]

In some mono-repo, executing nuitka command at the project root gives wrong output. For example,

root/
    - project1/
        - requirements.txt
        - README.md
        - project1/
            - app.py
            - other_modules.py

requires path-related inputs to be followed after "project1/"

I think it can be resolved by adding working-directory option in Github Action.