What is the variable G4F_API_KEY in the Dockerfile of Hugging Face?

[hhhaiai]

What is the variable G4F_API_KEY in the Dockerfile of Hugging Face?
Is it used to set the account password for access? Hugging Face G4F_API_KEY

FROM python:3.9

ARG G4F_API_KEY
ARG G4F_IGNORED_PROVIDERS

RUN useradd -m -u 1000 user
WORKDIR /app

COPY --chown=user ./requirements.txt requirements.txt
RUN pip install --no-cache-dir --upgrade -r requirements.txt

COPY --chown=user . /app

USER user

ENV HOME=/home/user \
	PATH=/home/user/.local/bin:$PATH

ENV G4F_API_KEY $G4F_API_KEY
ENV G4F_IGNORED_PROVIDERS $G4F_IGNORED_PROVIDERS

CMD python -m g4f --port 7860 --debug --g4f-api-key $G4F_API_KEY --ignored-providers $G4F_IGNORED_PROVIDERS

[hhhaiai]

Access Information
To access the space, please use the following login credentials:

Username: any
Password: gpt4free

如何设置？

[hhhaiai]

To modify the API endpoint from "http://localhost:5002/v1/chat/completions" to "http://localhost:5002/api/v1/chat/completions", simply replace the original URL with the new one in the cURL command, as shown below:

curl http://localhost:5002/v1/chat/completions \
  -H "Content-Type: application/json" \
  -d '{
    "model": "gpt-4o",
    "messages": [
      {"role": "user", "content": "Hello, how are you?"}
    ],
    "max_tokens": 100
  }'