GitHub Action I wrote doesn't have access to repo's files that is calling the action

A sample repo with the directory structure of what I'm working on is on GitHub here. To run the GitHub Action, you just need to go to the Action tab of the repo and run the Action manually.

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I have a custom GitHub Action I've written as well with python as the base image in the Docker container but want the python version to be an input for the GitHub Action. In order to do so, I am creating a second intermediate Docker container to run with the python version input argument.

The problem I'm running into is I don't have access to the original repo's files that is calling the GitHub Action. For example, say the repo is called python-sample-project and has folder structure:

python-sample-project
│   main.py
│   file1.py    
│
└───folder1
│   │   file2.py

I see main.py, file1.py, and folder1/file2.py in entrypoint.sh. However, in docker-action/entrypoint.sh I only see the linux folder structure and the entrypoint.sh file copied over in docker-action/Dockerfile with:

COPY entrypoint.sh /entrypoint.sh

Is it possible to access the main.py, file1.py, and folder1/file2.py in entrypoint.sh in the docker-action/entrypoint.sh?

from GitHub Action I wrote doesn't have access to repo's files that is calling the action