I see that there exist a requirements.txt file, and also an exclusion for .venv in the .gitignore file.
In order to run package_check locally, I had to create a virtual environment, install dependencies in it, and add source .venv/bin/activate in some file (in my case, it was in common.sh, but I feel like it may rather be in package_check.sh).
If these steps seem reasonable, I will be happy to propose a PR for this.