Feature Request: python-dotenv

[jraller]

Consider using python-dotenv (https://pypi.org/project/python-dotenv/) instead of using

export GENTAR_USER=
export GENTAR_PASSWORD=
export GENTAR_ENV=

as using a .env file makes it possible to automate the process without having to set those in the venv each time. It is also a good practice to include a .env.sample file in the project and add .env to the .gitignore (already present in this project's .gitignore file)